metal pipe fittings and couplings; metal pipe connectors; metal supports for piping; metal threaded pipe fittings; metal pipe flanges and metal pipe hangers; manually operated metal valves; metal pipe outlets; gasketed metal pipe couplings and fittings, manually operated metal check valves; metal pipe clamps; metal security devices, namely, locking mechanisms for preventing unauthorized access to fire protection apparatus; metal push-in couplings and connections, namely metal joints for use with hoses in a fluid distribution system; brass and iron pipe fittings; metal hose couplings, elbows of metal for pipes, copper pipe and fittings; metal compression couplings for use on gas, oil, water and steam, conducting pipes; metal manually-operated soft seated gas valves; metal pipe clamps for use with gas and water distribution pipes; casings of metal for use in pipe replacement, namely, a metal housing unit sealed about a pipe to repair and replace sections of pipe