Top 10 Best waterproof junction box outdoor in 2026

Last Updated - 6/13/2026

🏆Best Choice

Flemoon

Flemoon Large Outdoor Electrical Box (12.5 x 8.5 x 5 inch), IP54 Waterproof Extension Cord Cover Weatherproof, Protect Outlet, Plug, Socket, Timer, Power Strip, Holiday Light Decoration, Black

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•DIMENSIONS: External size is 12.5 x 8.5 x 5 inch. Inner size is 12 x 7.4 x 3.9 inch. 6*entry ports fit up to 12AWG/3C or Φ12mm cord.
•READ BEFORE PURCHASE: Each package only includes 1*outdoor electrical box. The power strip, surge protector, outdoor timer, extension cord and all other device are not included.
•Keep outdoor cord connection secure and protected. With the 4 clips, top lid, and rubber gaskets, this outdoor extension cord cover box is IP54 waterproof. Perfect to seal 12/14/16 gauge cord, braided cable and flat wire. Features with large space, good to protect your outdoor power strip, timer outlet plug, extension cord, large adapter.
•Easy to use, place the connection into the safety seal enclosure and clip the cord with the clamps. Simple to hang the box on any walls with the dual mounting holes.
•Ideal for a wide range of outdoor & indoor applications including wooden patio, lawn and garden power tools, Christmas holiday lighting, landscape decorations, pool pumps, fountains, fish ponds, patio heaters, hot tub, air conditioners, security cameras and more.
•Waterproof Tips: Do not place more than one cable in each port; Place the electrical box parallel to the ground, but do not place it vertically or obliquely; Do not submerge the box in water or bury it.

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$23.79

$27.99

-15%

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Hrensaw

Hrensaw Small Weatherproof Electrical Connection Box(Inner 5.5 x 3 x 2.2inch),Outdoor Electrical Box,Waterproof Extension Cord Covers for Plug, Extension Cables, Holiday Lights,Black

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•SIZE：External size: 8”x 3.9”x3.2”,Inner size: 5.5”x3”x2.2”, 2 cable ports, 2 snaps, 2 cable clamps, 2 rubber gaskets, Perfect for sealing 10/12/14/16 gauge cable(maximum compatibility Φ15mm cable) braided cable and flat cable.(Hand-measured, slight error)
•IP54 WATERPROOF: Made of heavy-duty reinforced PP material, it is rigorously tested to IP54 waterproof, high temperature and -40℃ freezing, can withstand up to 300 lbs. and is resistant to rain, water, snow, dust, dirt.Suitable for protecting outdoor power outlets, row plugs, timers, extension cords, adapters etc.
•WIDE APPLICATIONS：Ideal for a variety of outdoor & indoor applications including patio, lawn and garden power tools, Halloween and holiday lighting, landscape decorations, pool pumps, fountains, fish ponds, patio heaters, hot tub, security cameras etc,.
•2 WAYS TO USE: 1. Can be placed horizontally on a flat surface; 2. Independent keyhole design on the back for hanging. EASY TO USE: Simply put the connecting cable into the waterproof box, secure the cable with the clip, wrap the cable tightly with rubber and close the lid.
•WATERPROOF TIPS：Place the electrical box parallel to the ground, do not place it vertically or obliquely; Do not submerge the box in water or bury it in the ground.

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$13.59

$16.99

-20%

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Gratury

Gratury Junction Box, IP67 Waterproof Plastic Enclosure for Electrical Project, Hinged Grey Cover, Includes Mounting Plate and Wall Bracket 290×190×140mm (11.4"×7.5"×5.5")

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•Weatherproof & waterproof designed enclosure box, suitable for harsh outdoor environments or indoor industrial applications
•Includes a mounting panel for easy installing PCB board, terminal or any other electrical components which need to be fixed on
•Simple hinged cover, easy open and close, stainless steel latches can keep a good watertight
•High-grade ABS material, lightweight and sturdy, cable outlets can be easily drilled
•Safety lockable design to prevent un-authorized openings

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$24.99

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Otdorpatio

Otdorpatio Junction Box IP65 Waterproof ABS Plastic Electrical Project Case Power Junction Boxes, Project Box with Fixed Ear Black 7.87 x4.72 x2.95 inch (200x120x75 mm)

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•【Size】- Outer size of the project box: 7.87"x 4.72"x2.95"(200 x 120 x75 mm); Inner size of the project box:7.52" x4.37" x 2.68" (191 x111 x68mm)
•【Superior Electrical Safety】– IP65 Rated Indoor & Outdoor Waterproof Junction Box protect against dust, corrosion and splashing water, helps keep all your home electrical equipment Clean & Dry.
•【Superior Durable】- Made of high-quality ABS material that offers outstanding impact resistant and electrical insulation, Moisture-proof, sunscreen, anti-corrosion, durable for years use. can keep your equipment well-protected in harsh environments.
•【Easy for DIY】- This sturdy junction box can be drilled and shaped easily without cracking, so it’s also suitable for your various DIY projects.
•【Wild Application】Widely used for electronic projects, instrument enclosure, power supply units, temperature controller box, etc.****Package Content : 1xWaterproof Junction Box****

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$9.99

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YETLEBOX

YETLEBOX Outdoor Waterproof Electrical Box Junction Box Weatherproof IP67 ABS Plastic Enclosure Switch Router Project Box Electronics DIY Enclosure With Mounting Plate Wall Bracket Grey 8.6"x6.6"x4.3"

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•[EASY TO MOUNT] The outdoor waterproof electrical box includes mounting plate that allow you to mount your board or device in the project box easily. Also come with 4 stainless steel wall brackets can be used to hang the junction box on walls. Two 1/2" NPT cable gland are included in case you need to connect wires outside.
•IP67 GRADE - IP67 waterproof grade, which means dust-tight and protected from moisture challenges up to jetting water, keep all your electrical equipment Safe & Dry. It is widely used for both indoor and outdoor applications or projects.
•EASY FOR DIY - Simple hinged cover, easy open and close, Stainless steel latches make it more durable and provide better waterproof performance. This junction box can be drilled and shaped easily without cracking, so it’s also suitable for your various DIY projects.safety lockable design to prevent un-authorized openings
•DURABLE for YEARS - Made of high quality ABS plastic which has longer serve time and superior in impact resistance. Durable junction box can offer well protection for your projects in outdoor.
•SIZE - Outer Size of electrical enclosure: 220x170x110mm

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$14.99

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LuSumtly

Electrical Box, Outdoor Waterproof Box IP65 Junction Box with Reserved Holes,ABS Plastic Project Box Power Cord Enclosure Black 5.9 x 4.3 x 2.8 inch(150x110x70mm)

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•【Reserved Hole Design 】- The junction box is reserved holes design, Drill holes open on your demand and keep your inner projects dry with cable glands in package
•【SUPERIOR DURABLE】- Made of high-quality ABS material which offers outstanding impact resistant and electrical insulation, can keep your equipment well-protected in harsh environments.
•【IP65 GRADE】- Waterproof & weather designed, effectively block splashing water, rain, dust, snow, oil, UV, etc., can be widely used for both indoor and outdoor applications.
•【Size】- Outer Size: 5.9" x 4.3" x 2.8"/150 x 110 x 70mm(L*W*H); Inner Size: 5.87" x 4.25" x 2.52"/149 x 108 x 64mm(L*W*H); Thickness : 0.1''/2.5mm; Screw Thread Dia.: 0.12"/3mm
•【Package Content 1x Black Junction Box; 4x Stainless Steel Screws; 2x M24 Black Cable Gland.

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$6.99

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LuSumtly

IP67 Waterproof Junction Box, ABS Plastic Electrical Enclosure with Stainless Steel Latch, Hinged Cover Electric Box with Mounting Plate, Wall Brackets & Cable Glands 280x190x140mm

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•IP67 Waterproof & Built for the Outdoors - The junction box is IP67 waterproof certificated, built-in sealing gasket, offering complete protection against water, dust, and harsh weather conditions. Whether it’s rain, humidity, or snow, this box ensures your electrical connections stay safe and secure, making it perfect for outdoor use.
•Premium Quality & Durability - The electrical box is crafted from virgin ABS material, delivers superior impact resistance, UV protection, and excellent electrical insulation. The stainless steel latches add extra durability, ensuring a tight seal and long-lasting performance even in the toughest environments.
•Easy to Customize & Install - This outdoor waterproof box is easy to drill without cracking, allowing you to create custom openings effortlessly. The included accessories—such as the mounting plate, stainless steel wall brackets, cable glands, and Din rail—make installation quick and straightforward, saving you time and effort,designed for hassle-free DIY projects
•Complete Protection & Seal - The combination of ABS construction and stainless steel latches ensures a secure, watertight seal that protects your electrical components from water, dust, and other environmental hazards. This makes it ideal for both indoor and outdoor installations.
•Convenient & User-Friendly - Featuring a hinged cover and easy-access design, this junction box allows for quick maintenance and operation.
•Versatile & Multi-Purpose Design - With a range of sizes available, this junction box is suitable for various applications, including lighting systems, solar panels, irrigation systems, routers, and more. Its universal design ensures it can adapt to both residential and commercial projects, offering flexibility and reliability.

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$13.49

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NineLeaf

Outdoor Junction Box,Nineleaf IP66 Weatherproof Electrical Project Boxes PVC/ABS Plastic Enclosure Box Universal Watertight 4.9 x 3.3 x 2.3 inch (125x86x62mm), Fit with 20mm Cable Gland Grey

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•【Weatherproof Junction Box Outdoor】The waterproof Junction box is made of ABS and PVC plastic, IP66 waterproof rated. Solid construction and a good seal to protect against sun exposure, dust, corrosion,splashing water and rats. Very suitable for outdoor use.
•【Size】Outer Size:125x86x62mm (4.9 x 3.3 x 2.3 inch) Inner size(Approx):117x 76x 38mm(4.6 x 3 x 1.5 inch) ; Color:grey. Mounted type:surface mounted.
•【Watertight PVC Junction Box 4.6 x 3】The DIY opening hole design greatly ensures the sealing of the waterproof project box. Up to 9 holes can be distributed on the 4 sides and bottom of the waterproof box. You can make holes according to your needs.
•【Weatherproof Electrical Junction Box】The waterproof electronic box has cover with 4 screws to fix it. There is a gasket rubber at the box between the cover and the waterproof box, which can make the waterproof box more sealed to ensure safe use in bad weather.
•【Related Cable Gland】The waterproof project box can be configured with 20 mm Cable Glands Joints, you can purchase it additionally according to your needs（ASIN: B077QMB3MG).The waterproof junction box suitable for aboard, garage, house, garden, farm, pond, underground, terrace, workshop, construction site, external wiring or external lighting etc.

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$11.62

$12.91

-10%

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Helunsi

Helunsi 2 Pieces Waterproof IP68 External Junction Box, 2 Way Outdoor Junction Box, Underground Plug Line Coaxial Cable Connector Wire Range 5 to 15mm Electrical Power Cord Weatherproof Boxes - Black

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•IP68 Waterproof >>> The Helunsi outdoor junction box is of IP68 high-level waterproof class, weatherproof, moisture-proof, dust-proof and anti-UV, making it safe to use in the sun, wet environment, rainy or snowy days, provides total protection for your junction cables.
•High-Quality Materials >>> 2 way junction box has good waterproof performance, with high quality plastic PC housing and waterproof silicone seal, which will not crack or fade in harsh environment, corrosion and high temperature resistant, durable for years use.
•Specification >>> Pack of 2. Internal dimensions: L 2.83 x W 1.89 x H 1.26inch. External dimensions: L 5.31 x W 2.72 x H 1.38inch. One input and one output, conduit cable gland is equipped with 3 sets of silicone seals of different thicknesses, applicable cable size range: imperial units 3/16" to 11/32", 11/32" to 15/32", 15/32" to 19/32" (Metric units 5-9mm/9-12mm/12-15mm). Comes with 3 screw terminal connector and mounting kit. Maximum voltage: AC 450V. Maximum current: 24A.
•Easy to Install >>> It can be installed under the ground or on the wall, horizontally or vertically as indoor or outdoor junction box, tightening the exterior screws with a screwdriver for a complete seal. Design for detachable box and cover, the waterproof silicone layer is precise and tight, by rotating and tightening the cable gland nut at both ends can lock and seal the cable.
•Wide Usage >>> Our Helunsi junction box can protect the connections of outdoor electrical appliances and wiring, which is suitable for external lighting facilities requiring waterproof or weatherproof protection, street lights, irrigation machine, solar equipment, outdoor LED display, garden lights, outdoor flood lights, landscape lights, underground electrical and more.

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$15.99

$18.99

-16%

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LuSumtly

Outdoor Waterproof Box,Junction Box Reserved Holes IP65 ABS Plastic Electrical Boxes Power Cord Enclosure Project Box Black Outer Size 5.9 x 4.3 x 2.8 inch(150x110x70mm)

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•【Reserved Hole Design Project Box】- The junction box is reserved holes design, Easy to drill holes to complete your DIY projects.
•【IP65 Outdoor Waterproof Box】- Waterproof & weather designed, effectively block splashing water, rain, dust, snow, oil, UV, etc., can be widely used for both indoor and outdoor applications.
•【 Safe and Certificated】Our products are certified and compliant with industry standards, IP65, CE and RoHS certificated, providing you with peace of mind when using our electrical box.
•【Superior Sturdy】- Made of high-quality ABS material which offers outstanding impact resistant and electrical insulation, can keep your equipment well-protected in harsh environments.
•【Size of the Connection Box 】- Outer Size: 5.9" x 4.3" x 2.8"/150 x 110 x 70mm(L*W*H); Recommended Internal Available Size: 4.9"x3.3"x2.5"/124x84x64mm; Thickness : 0.1''/2.5mm; Screw Thread Dia.: 0.12"/3mm
•in order to confirm the detailed installation dimensions, please refer to our detail image, which shows specific internal dimensions of the product

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$5.59

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