FILL-RITE Pressure Tank Vent Cap with 2 in. (5 cm) Base

The FILL-RITE Vented Fill Cap with 2 in. Base is to replace any old fill caps with the entire base. Pressure part of the cap opens at 2.5 psi. Venting part of the cap opens at 1.5 oz. when pump is operating.Relieves dangerous vapor buildup and over expansion/contraction of the tankFits standard 2 in NPT threaded bungCap opens at 2.5 psiVent opens at 1.5 oz.Cast iron base