Garvin 53171-S 4" Square Extension Ring, Welded, 2-1/8" Deep w/ (6) 1/2" & (6) Combo Knockouts

4 in square 2-1/8 in deep welded extension rings with (8) 1/2 in & (4) 1/2 in-3/4 in side conduit knockouts are added to junction boxes to increase wiring capacity and provide access for additional conduit runs and electrical wire. Garvin' extension rings prevent the need to remove old conduit boxes and wiring from circuits when additional wiring is needed. Their bottom mounting slots allow a quick installation onto existing boxes.