Quick Relief Valve f/All Sigmar & B3 Heaters Pressure. Quick Pressure Relief Valve for All Sigmar & B3 Heaters Pressure Relief Valve - 1/2" fitting brass chrome plated pressured up to 6 bars Bristish standard thread fitting Overall length 1-3/4" Relief/non return that allows discharging of the water heater in case of disuse Specifications for Quick Pressure Relief Valve f/All Sigmar & B3 Heaters: Manufacturer: Quick Color: Black Package Contents: Quick Pressure Relief Valve f/All Sigmar & B3 Heaters Quick FVSLVS126B00A00: Relief Valve f/All Sigmar & B3 Heaters Pressure