For 20 & 30A Hart-Lock flanged inlets & outlets and 30 & 50A, 3-W straight blade receptaclesTwo sets of 3 equally spaced holes: 3 holes on 2.5" (63.5mm) bolt dia. circle and 3 holes on 2.69" (68.3mm) bolt dia. circle.
-Weatherproof Nylon Covers for 15A, 20A & 30A Devices - Glass-Filled Nylon Covers. UL Listed for wet locations (cover closed) & damp locations (cover open or closed). Meets 2008 NEC 406.8 (A) and 406.8 (B)(2). Rugged, glass-filled nylon provides high strength and wide temperature range for long life in abusive environments. Easy mounting on FS/FD boxes or equipment panels. Self-closing lift lid cover with neoprene gasket and stainless steel spring provides weatherproof protection. Universal mounting holes to accept all Cooper 20A and 30A locking flanged inlets and outlets, receptacles as well as devices with similar dimensions from other manufacturers.