With Rounded corners for round corner accessories KNOCKOUTS: One 'cut-out' for 20mm round conduit in top face, two 'cut-outs' for 20mm or 25mm oval conduit in lower face and one 20mm round 'pushout' in the base. Both boxes are suitable for fitting over 1 gang and 2 gang BS 4662 flush steel boxes respectively DIMENSIONS: 2 gang: 87 x 148mm FIXING CENTRES: 2 gang: 120.6mm BS 4662: 2006 where applicable
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