fire hydrant, indoor fire hydrant, fire hydrant valve 1. 50mm(2"), 65mm(2 ... ") 2. six types 3. copper rod, copper ring fire hydrant, indoor fire hydrant, fire hydrant valve1.conventional type: SN50, DN50; SN65 ... .6MPa, Strength test pressure 2.4MPa.The indoor fire hydrant is a fixed indoor fire-fighting equipment in factories, warehouses, high-storey buildings ...