... types 3. copper rod, copper ring fire hydrant, indoor fire hydrant, fire hydrant valve1.conventional type: SN50, DN50; SN65, DN652.pressure reducing&stablizing type: SNW65-I, DN653 ... W.P. 1.6MPa, Strength test pressure 2.4MPa.The indoor fire hydrant is a fixed indoor fire-fighting equipment in factories, warehouses, high ...