2 GANG 38mm BOX 8 x 20mm KNOCKOUTS FOR SURFACE MOUNT (REQUIRE 1 XK3703 OR K3704 AND COVER PLATE K3493 OR K3494ALM ALSO YOUR CHOICE OF GRID MODULES) All boxes have a base knockout and feature self-levelling platforms to ensure that the mounting frame is always positioned correctly without the need for adjustment. BS 5733: 1995 where applicable |