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โก Weatherproof your power with confidence โ the junction box that means business!
The Masterplug WPJB Outdoor Weatherproof Junction Box is a robust, IP66-rated electrical enclosure designed for secure outdoor wiring. Featuring a 5 pole terminal block and a compact 15x15x5 cm footprint, it offers versatile cable management with multiple knockout points. Its high-impact ABS construction, colour-matched screw covers, and 25-year warranty make it a reliable choice for professionals seeking durable, weatherproof electrical solutions.








| Brand | Masterplug |
| Colour | Grey |
| Finish type | Painted |
| Material | Acrylonitrile Butadiene Styrene |
| Product dimensions | 5D x 15W x 15H centimetres |
| Style | Outdoor Weatherproof Junction Box, 5 Pole Terminal Block |
L**R
Durable outdoor junction boxes.
Solid, well built, weatherproof, been holding up well outdoors for spotlight installation.
A**E
Very good quality and very roomy
I needed an outdoor junction box as I have 4 cables coming out of wall, both electrical and network to go into a trunk underground. The box is absolutely the right size, not too big to look ugly and not too small that becomes tight inside for the number of cables/junctions I have. For my use it is the right size. It provides good options for cable entry through back, which what I needed. It is well marked, I used a drill to drill the right size hole in the back to allow all my cables in, I added a grommet myself (not included), then exit through 2 glands at the bottom. Worth noting that the 5 entry points (1 on top, 1 on each side and 2 on bottom do not require drilling, you can just push them out, only the back required using a drill). Everything worked well, no cracks no problem.
A**R
Different brand supplied, but very good for the price.
The box itself is very good, decent quality plastic, press-out knockouts (the one on the back is drill-out but that's fair), shrouded drain holes, grommets supplied for all fixing entries. It doesn't come with glands, but if you expected it to you should probably have called a sparky to do the job for you (especially as plenty of outdoor electrical jobs are in-scope for Part P). That said, the box I recieved was supplied with Masterplug rather than British General branding. BG and Masterplug are part of the same company/group, but in my experience the BG branded items are very high quality and mostly sold by trade suppliers, whereas Masterplug is the brand you'd find on the cheapest made-in-China extension lead in the Tesco homeware aisle. If I'd have known this, I might have shopped around first. All in it's great for the price, but the branding is worth bearing in mind if you were going to pay a premium for British General.
T**H
Well-Made and Robust Junction Box
Excellent product - robust and water tight. Good instructions. Feels well made.
B**T
Well-made Junction Box
This is a very well-made tough plastic Junction Box with easy-access removable front cover. The holes for electrical cable glands are formed merely by pushing out the replaceable covers. An ideal weather proof junction Box and good VFM.
J**S
Good Quality
As described, good quality, needed for outside use so very useful no metal parts to rust.
C**N
Easy to open and close
Easy to open and close with a 1/4 turn of the 4 locking screws. It works well. Exactly what I wanted.
D**C
Good box and easy fitting
Good knockout holes to all sides and easy rust free lid locking method. BG brand not Masterplug as advertised.
Trustpilot
3 weeks ago
3 weeks ago