20mm Metal Extension Ring Galvanised Each[20ERG]
20mm Galvanised Extension Ring, gives an extra 20mm depth to your besa box when you don't have enough space. Fits 20mm & 25mm conduit boxes.
- Type of Accessory: Extension ring
- Size: 20mm Extension
- Material: Bright zinc plated steel
- Standards: BS 4568 & BS31 where applicable
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