Best Outdoor Cable Glands for Weatherproof Connections: 2025 Expert Review
Oli
Owner & 18th Edition Electrician, OR Electrics
If you have ever had your outdoor lights trip the main RCD during a heavy downpour, nine times out of ten, a poor cable entry is to blame. Most people focus on the light fitting itself, but if the cable gland—the device that grips and seals the wire entering the box—isn't water-tight, you are inviting trouble.
In Leeds, where we have plenty of rain and damp Victorian brickwork, using the wrong gland is a guaranteed way to rot your connections. Whether you are running power to a shed in Armley or installing security lights in Headingley, the gland acts as the first line of defence against moisture.
In this review, I've selected three types of glands I use regularly: a budget-friendly pack for standard jobs, a high-quality nylon option for unmatched durability, and a specialised brass gland kit which is the only safe option if you are running Steel Wire Armoured (SWA) cable.
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Specs vs. The Real World
The Spec: "IP68 Waterproof Rating"
"IP68 implies the product can be submerged underwater indefinitely without leaking."
This is only true if the cable is perfectly round and fits the compression seal exactly. If you use flat Twin & Earth cable in a round gland without extra silicone or a specific insert, water will track down the flat sides.
The Spec: "One Size Fits All"
"A standard M20 gland fits all 'standard' cables."
Glands have a specific clamping range (e.g., 6-12mm). If your cable is too thin, it won't seal. If it's too thick, you'll strip the thread trying to tighten it. Always check the diameter.
My Top 3 Recommendations
Three options to cover different needs and budgets
10 Pack M20 20mm IP68 Waterproof White Cable Glands
AVARTEK
For general outdoor lighting tasks using round flex, these AVARTEK glands are a staple. They offer an IP68 rating at a very accessible price point, making them perfect for homeowners tidying up multiple entry points on junction boxes or rotary isolators.
The Good
- Excellent value – works out at under 60p per gland
- Standard M20 size fits almost all domestic outdoor accessories
- Includes locknut and washer (often sold separately on trade counters)
The Bad
- Plastic threads can cross-thread if forced
- Locknuts are basic nylon, less secure than brass alternatives
Installer Tip:
Don't use pliers to tighten the dome nut; you will deform the plastic. Hand-tighten it firmly, then give it just a quarter turn with a spanner. If you are using grey flat cable, squeeze a dab of silicone sealant inside the rubber seal before tightening to fill the gaps.
Priced at £5.85 at the time of writing
Check Price on AmazonMeccion M25 Cable Gland 5 Pack IP68 Waterproof Nylon
Meccion
These Meccion glands are a step up in quality, utilising PA-66 nylon which offers superior UV and impact resistance compared to recycled plastics. Being M25 size, they handle thicker cables (12-18mm), making them ideal for heavy-duty rubber flex often used in pond pumps or high-power garden lighting.
The Good
- High-grade PA-66 nylon resists becoming brittle in the sun
- Thickened rubber sealing ring ensures a very tight compression
- Fire retardant grade 94v-2 for added safety
The Bad
- M25 size won't fit standard M20 knockouts without enlarging the hole
- More expensive per unit
Installer Tip:
Since these are M25, ensure your junction box or enclosure has 25mm knockouts or you have a 25mm hole saw/step drill handy. These are excellent for thick 'Arctic Grade' flex or armoured cables where the outer sheath is substantial.
Priced at £11.99 at the time of writing
Check Price on AmazonSWA CW20S Outdoor Cable Gland Pack 20 mm
SWA
This is crucial: you CANNOT use plastic nylon glands for Steel Wire Armoured (SWA) cable. You must use a proper brass gland kit like this CW20S pack. It is designed to clamp the steel armour strands to maintain earth continuity, which is a critical safety requirement in the wiring regulations.
The Good
- The only compliant way to terminate outdoor SWA cable
- Provides mechanical strength by gripping the steel armour
- Ensures earth continuity (essential for safety)
The Bad
- Requires more skill and tools (hacksaw, spanners) to fit correctly
- Brass can tarnish if the shroud isn't fitted properly
Installer Tip:
When fitting this, ensure the 'banjo' (the brass earth tag) is bolted tightly to the enclosure and connected to the earth wire. If you are fitting into a plastic box, using a 'piranha nut' (locking nut with teeth) can help bite into the plastic for a solid grip, but the independent earth fly-lead is non-negotiable.
Priced at £7.25 at the time of writing
Check Price on AmazonFrequently Asked Questions
Can I use indoor glands outside?
How do I stop water running down the cable into the gland?
Why do I need a brass gland for armoured cable?
Do I need a professional to fit outdoor cable glands?
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