fire hydrant, indoor fire hydrant, fire hydrant valve 1. 50mm(2"), 65mm(2 1/2") 2. six types 3. copper rod, copper ring fire ... hydrant, indoor fire hydrant, fire hydrant valve1.conventional type: SN50, DN50; SN65, DN652 ... Strength test pressure 2.4MPa.The indoor fire hydrant is a fixed indoor fire-fighting equipment in factories, warehouses, high- ...