Pressure gauge valves are used as shut-off and throttle device between pressure gauge and pressure line for high operating pressures and temperatures. finishing : buff polished chrome plating nickel plating material used: finest quality gun metal size available: 18” bsp ¼” bsp 38” bsp ½” bsp ¾” bsp 1” bsp hydraulic test pressure: 60 to 200 psi as per requirement.