Joinfworld 9x5x4.3 Outdoor Extension Cord Cover for Outside Waterproof Outdoor Electrical Box Outlet Plug Cover Cord Protector Plastic Connection Box for Power Strip Lights Pump Controllers

Joinfworld 9x5x4.3 Outdoor Extension Cord Cover for Outside Waterproof Outdoor Electrical Box Outlet Plug Cover Cord Protector Plastic Connection Box for Power Strip Lights Pump Controllers
Price: $88.88 - $23.98
(as of Mar 05,2026 05:08:47 UTC – Details)

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Customers say

Customers find the extension cord cover to be a quality product that works well, with zero water intrusion and keeps connections dry. They appreciate its sturdy build, easy installation, and perfect fit, with one customer noting that the rubber gaskets seal unused openings effectively. The size receives mixed feedback – while some find it large enough for their needs, others mention it's a bit small on the inside.

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17 customers mention quality, 17 positive, 0 negative

Customers find the extension cord cover to be of good quality, with one customer specifically mentioning it works well as a dry box.

Great product and fast serviceRead more

Good product, does the jobRead more

…This box is sturdy. Has a place for a small padlock if desired. Great quality….Read more

Excellent quality, tight seal against the elements…Read more

15 customers mention waterproof, 14 positive, 1 negative

Customers find the extension cord cover waterproof, with multiple reviews confirming zero water intrusion, and one customer noting its effectiveness during rain.

Works great. Waterproof. Keeps the controller for my outside lights nice and dry.Read more

Large enough for my intended purposes. Keeps the water out and seems fairly sturdy. Haven’t had any issues with leakage or cracks.Read more

Water tight, preforms as expected.Read more

Great quality, easy install, and truly weatherproof….Read more

15 customers mention works well, 15 positive, 0 negative

Customers find that the extension cord cover works well, with one mentioning it performs extremely well even in cold conditions.

Use this to hold a wifi repeater inside and it works great. We now have internet in our storm cellar.Read more

Works wellRead more

…inflatables and weatherproof LED lighting and it's working extremely well despite the cold, high humidity and several days of direct rain….Read more

Works perfectly for the electrical connection for my security cameras.Read more

9 customers mention fit, 9 positive, 0 negative

Customers are satisfied with how the extension cord cover fits, with one mentioning that the rubber gaskets seal unused openings easily.

…The rubber gaskets to seal unused openings fit easily and secure the box for an outdoor "media" center.Read more

I’m impressed with the quality. It is meeting my requirements without any issues. Highly recommend.Read more

Used this for timed devices so a lot fit inside with room to work around. Sturdy build.Read more

…However, it is very well sealed from my inspection of it. Gaskets were good and tight.Read more

8 customers mention ease of installation, 8 positive, 0 negative

Customers find the extension cord cover easy to use and mount, with one mentioning it's simple to install under a deck.

Easy to install, waterproof, perfect for my needs.Read more

Simple & secure way to extend your network outside…Read more

It was exactly what I expected it to be. Easy to mount (though I had to angle in the power screwdriver a bit), spacious enough for a small power…Read more

High quality product. Easy to use and mount. Will definitely keep my stuff safe. A little smaller than I expected but that's on me….Read more

7 customers mention build quality, 6 positive, 1 negative

Customers appreciate the build quality of the extension cord cover, noting its sturdy construction, with one customer mentioning that the boxes will last forever.

…This box is sturdy. Has a place for a small padlock if desired. Great quality….Read more

…very good quality & heavy duty. has been through a couple of good rains and performed exactly as needed. Highly recommend.Read more

Sturdy build.Read more

Large enough for my intended purposes. Keeps the water out and seems fairly sturdy. Haven’t had any issues with leakage or cracks.Read more

7 customers mention sturdiness, 7 positive, 0 negative

Customers find the electrical housing sturdy, keeping cords and connections dry, with one customer noting it works well for holiday powered outdoor decorations.

…these scattered through out my yard for holiday decorations to keep my cords dry….Read more

…use all the space, but it's nice to have extra ports and dry space for seasonal needs, while keeping it all tidy.Read more

…However, after discovering these boxes, I now have an organized DRY area for these electrical connections….Read more

Works great. Waterproof. Keeps the controller for my outside lights nice and dry.Read more

11 customers mention size, 7 positive, 4 negative

Customers have mixed opinions about the extension cord cover's size, with some finding it large enough for their intended purposes while others note it's a bit small on the inside.

Large enough for my intended purposes. Keeps the water out and seems fairly sturdy. Haven’t had any issues with leakage or cracks.Read more

Decent little box. It's a bit small on the interior so I had to modify the outlet unit I put in there (cutting off some trim) but overall happy with…Read more

spacious enough for a small power strip, and seals tightly.Read more

…Overall it's a roomy and clean looking box….Read more


I will only buy this brand; quality accessories included!

5 out of 5 stars

I will only buy this brand; quality accessories included!
Re: 11.4 x 7.5 x 5.5 Electrical Box. I have WiFi cameras around my property. On the West side, I have 3 to capture (hopefully) wildlife entering or exiting. Prior to discovering these boxes, I just wrapped the 3 prong end of the extension cord in a gallon seal bag and taped the heck out of it so that water could not permeate into the area tripping the cameras off due to moisture (see photo). However, after discovering these boxes, I now have an organized DRY area for these electrical connections. What I love most about these particular boxes is that the manufacturer hits you up with a plethora of accessories AND there are pre-drilled holes in one side of the box. The accessories include the black rubber pieces (the “rubber mats” and “cord rubber mats”). The rubber mats block off a hole not being used and the rubber cord mats block off most of a hole except for the area where your cord runs through it (see photo). MOST boxes don’t come with these accessories and you must tape (or something) the extra space up making for a sloppy end result. This manufacturer also includes mounting brackets and screws (although I found the screw exceptionally short, but screws are easy to replace). Because my box was wider than my post, I installed a horizontal board first and then attached this box to that board. This particular camera area has a bird baffle that I mounted over it (to preclude rain from reaching the camera area) so for this particular set up I installed the box with the holes facing up vs. down (see photo). (I installed another box with the holes facing down in an area without a baffle protecting it). This box is sturdy. Has a place for a small padlock if desired. Great quality. So happy I found a manufacturer that provides accessories! That was THE biggest challenge in the past. Now i can start replacing all of my “baggies” with waterproof electrical boxes without worry of moisture, bugs or birds (yep – I had a pair of wrens circumvent the tape that I had covering unused holes in an accessory-less box that I used 2 years ago . . . And they built a nest before I knew it. It was a small area to bring up 5 babies, but it didn’t bother them. It did, however, make a mess in the box). Now they too will be blocked off by the “rubber mats” that are provided. Purchased several of these boxes. One 5” larger to accommodate an outdoor surge protector strip. Very happy with that decision. These boxes will last forever. AND due to the sheer number of extra accessories provided, the rubber mats can be replaced in the future if necessary. More than once. Photos: Before; After; from inside box looking at both types of rubber mats; from top looking at both types of rubber mats; side of box; back of box with mounting brackets and screws included; extra accessories. Note: 4 mounting brackets and screws are provided (I only used 2); more than twice the number of accessories are provided as shown in my last photo, I just didn’t have them all out of the bags.

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Top reviews from the United States


  • Reviewed in the United States on February 19, 2026

    Size: 11.4“x7.5"x5.5" ClearVerified Purchase

    Re: 11.4 x 7.5 x 5.5 Electrical Box. I have WiFi cameras around my property. On the West side, I have 3 to capture (hopefully) wildlife entering or exiting. Prior to discovering these boxes, I just wrapped the 3 prong end of the extension cord in a gallon seal bag and taped the heck out of it so that water could not permeate into the area tripping the cameras off due to moisture (see photo). However, after discovering these boxes, I now have an organized DRY area for these electrical connections.

    What I love most about these particular boxes is that the manufacturer hits you up with a plethora of accessories AND there are pre-drilled holes in one side of the box. The accessories include the black rubber pieces (the “rubber mats” and “cord rubber mats”). The rubber mats block off a hole not being used and the rubber cord mats block off most of a hole except for the area where your cord runs through it (see photo). MOST boxes don’t come with these accessories and you must tape (or something) the extra space up making for a sloppy end result. This manufacturer also includes mounting brackets and screws (although I found the screw exceptionally short, but screws are easy to replace).

    Because my box was wider than my post, I installed a horizontal board first and then attached this box to that board. This particular camera area has a bird baffle that I mounted over it (to preclude rain from reaching the camera area) so for this particular set up I installed the box with the holes facing up vs. down (see photo). (I installed another box with the holes facing down in an area without a baffle protecting it).

    This box is sturdy. Has a place for a small padlock if desired. Great quality.

    So happy I found a manufacturer that provides accessories! That was THE biggest challenge in the past. Now i can start replacing all of my “baggies” with waterproof electrical boxes without worry of moisture, bugs or birds (yep – I had a pair of wrens circumvent the tape that I had covering unused holes in an accessory-less box that I used 2 years ago . . . And they built a nest before I knew it. It was a small area to bring up 5 babies, but it didn’t bother them. It did, however, make a mess in the box). Now they too will be blocked off by the “rubber mats” that are provided.

    Purchased several of these boxes. One 5” larger to accommodate an outdoor surge protector strip. Very happy with that decision. These boxes will last forever. AND due to the sheer number of extra accessories provided, the rubber mats can be replaced in the future if necessary. More than once.

    Photos: Before; After; from inside box looking at both types of rubber mats; from top looking at both types of rubber mats; side of box; back of box with mounting brackets and screws included; extra accessories.

    Note: 4 mounting brackets and screws are provided (I only used 2); more than twice the number of accessories are provided as shown in my last photo, I just didn’t have them all out of the bags.

    Customer image


    5.0 out of 5 stars

    I will only buy this brand; quality accessories included!

    Reviewed in the United States on February 19, 2026


    Re: 11.4 x 7.5 x 5.5 Electrical Box. I have WiFi cameras around my property. On the West side, I have 3 to capture (hopefully) wildlife entering or exiting. Prior to discovering these boxes, I just wrapped the 3 prong end of the extension cord in a gallon seal bag and taped the heck out of it so that water could not permeate into the area tripping the cameras off due to moisture (see photo). However, after discovering these boxes, I now have an organized DRY area for these electrical connections.

    What I love most about these particular boxes is that the manufacturer hits you up with a plethora of accessories AND there are pre-drilled holes in one side of the box. The accessories include the black rubber pieces (the “rubber mats” and “cord rubber mats”). The rubber mats block off a hole not being used and the rubber cord mats block off most of a hole except for the area where your cord runs through it (see photo). MOST boxes don’t come with these accessories and you must tape (or something) the extra space up making for a sloppy end result. This manufacturer also includes mounting brackets and screws (although I found the screw exceptionally short, but screws are easy to replace).

    Because my box was wider than my post, I installed a horizontal board first and then attached this box to that board. This particular camera area has a bird baffle that I mounted over it (to preclude rain from reaching the camera area) so for this particular set up I installed the box with the holes facing up vs. down (see photo). (I installed another box with the holes facing down in an area without a baffle protecting it).

    This box is sturdy. Has a place for a small padlock if desired. Great quality.

    So happy I found a manufacturer that provides accessories! That was THE biggest challenge in the past. Now i can start replacing all of my “baggies” with waterproof electrical boxes without worry of moisture, bugs or birds (yep – I had a pair of wrens circumvent the tape that I had covering unused holes in an accessory-less box that I used 2 years ago . . . And they built a nest before I knew it. It was a small area to bring up 5 babies, but it didn’t bother them. It did, however, make a mess in the box). Now they too will be blocked off by the “rubber mats” that are provided.

    Purchased several of these boxes. One 5” larger to accommodate an outdoor surge protector strip. Very happy with that decision. These boxes will last forever. AND due to the sheer number of extra accessories provided, the rubber mats can be replaced in the future if necessary. More than once.

    Photos: Before; After; from inside box looking at both types of rubber mats; from top looking at both types of rubber mats; side of box; back of box with mounting brackets and screws included; extra accessories.

    Note: 4 mounting brackets and screws are provided (I only used 2); more than twice the number of accessories are provided as shown in my last photo, I just didn’t have them all out of the bags.

    Images in this review


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  • Reviewed in the United States on December 30, 2025

    Size: 9"x5"x4.3" ClearVerified Purchase

    Works great. Waterproof. Keeps the controller for my outside lights nice and dry.

  • Reviewed in the United States on June 21, 2025

    Size: 9"x5"x4.3" ClearVerified Purchase

    Great quality, easy install, and truly weatherproof. The rubber gaskets to seal unused openings fit easily and secure the box for an outdoor "media" center.

  • Reviewed in the United States on September 25, 2025

    Size: 9"x5"x4.3" ClearVerified Purchase

    Water tight, preforms as expected.

  • Reviewed in the United States on May 23, 2024

    Size: 9"x5"x4.3" ClearVerified Purchase

    I purchased this box to secure the connections between the my outdoor fountain power and lights to dual plug smart outlet on my outdoor extension cord. The box was easy to mount under my deck with the included hardware, and the dimensions on the website were accurate and I was able to run three cords into the box from underneath. The box came with a peel-off plastic covering to protect the translucent lid during shipping, and rubber plugs were included to close off the wire holes if I didn't use them. The rubber gasket insures that the lid keeps water out, and the latches really hold it tightly shut.

    One person found this helpful


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  • Reviewed in the United States on December 16, 2024

    Size: 9"x5"x4.3" ClearVerified Purchase

    High quality product. Easy to use and mount. Will definitely keep my stuff safe. A little smaller than I expected but that's on me. The protective plastic is extremely difficult to get off the cover.

  • Reviewed in the United States on July 12, 2024

    Size: 9"x5"x4.3" ClearVerified Purchase

    Perfect for my application. I have an exterior outlet in my yard for my pond pump and landscape lighting. I wanted to add an air pump for the pond, but needed one extra plug, so I purchased a 3 outlet multi strip and it fit perfect in this box. Now all three electric lines run through the bottom of this box and plug in to the multi strip and then the multi strip runs back out of the bottom and back to my outlet. now I have and extra plug at the outlet for any future needs.

  • Reviewed in the United States on March 1, 2026

    Size: 9"x5"x4.3" ClearVerified Purchase

    can't go wrong with this box !!!


Top reviews from other countries

  • DJH
    5.0 out of 5 stars

    Easy to install and large enough for everything.

    Reviewed in Canada on December 17, 2025

    Size: 9"x5"x4.3" ClearVerified Purchase

    We used this box to hide our Govee lights controls. It works amazing. Super easy to put up, and to load everything in.

  • Radim L.
    5.0 out of 5 stars

    Great product

    Reviewed in Canada on December 4, 2025

    Size: 9"x5"x4.3" ClearVerified Purchase

    Great quality, Works as it should.

  • Amazon Customer
    5.0 out of 5 stars

    Excellent product

    Reviewed in Canada on October 19, 2025

    Size: 9"x5"x4.3" ClearVerified Purchase

    This is a great size, put an outdoor water proof power bar and you will not have any issues

  • Diana
    5.0 out of 5 stars

    Pay for quality

    Reviewed in Canada on September 6, 2024

    Size: 9"x5"x4.3" ClearVerified Purchase

    Not cheap to protect outdoor christmas lights power adapter from upcoming Canadian snowy winter but really good quality and easy to install onto siding. Does the trick very well. Bought a second one.

  • Amazon Customer
    4.0 out of 5 stars

    Pretty good despite a couple of flaws.

    Reviewed in Canada on October 9, 2025

    Size: 9"x5"x4.3" ClearVerified Purchase

    As another reviewer noted, when mounting vertically, the fastening holes on the bottom of the box are upside down, so you can't mark the holes, insert the screws, and then just slot the box onto them. Also, the lock hole is kind of a joke. Anyone could grab and twist the lock to break the plastic on the cover and access the box if they really wanted. Despite these flaws, it seems water tight and houses my switch and adapter for my Govee outdoor lights just fine.







Product Summary: Joinfworld 9x5x4.3 Outdoor Extension Cord Cover for Outside Waterproof Outdoor Electrical Box Outlet Plug Cover Cord Protector Plastic Connection Box for Power Strip Lights Pump Controllers

From Joinfworld
【Hinged Transparent Cover】 This outdoor electrical box waterproof with hinged clear cover provides an easy view of the inside electronic devices status at a glance. The internal size of the extension cord cover is 8.1″x4.2″x3.8″.
【Heavy Duty Plastic】 The thickness of this outdoor extension cord cover for outside waterproof is 3.5mm, which is much more solid and firm compared to other outdoor plug covers. The latch of this outdoor power strip cord cover is made of 304 stainless steel.
【Fixed Bracket】 This outdoor extension cord cover with fixed bracket inside, so you can install electrical equipments easily. In addition, black silicone plugs can effectively prevent water from entering, making outlet cover extension cord work well in humid environment.
【Wall-mounted Design】 The waterproof extension cord cover is wall-mounted designed. Therefore, the enclosure can not only be placed flat on the ground but also hung on tree or wall.
【Wide Application】 This outdoor plug protector will come with 5 pieces of silicone plugs to enhance its waterproof performance, makes it hold a wide range of indoor and outdoor applications, such as power strips, Christmas lights, garden power tools, pump controllers, security cameras, fences, patio heaters, etc.

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