Vacuum Relief Valve, Body Material Brass, Flow Rate - Maximum 90 cfm, Inlet Port Connection Gender Male, Inlet Port Connection Size 3/4 in, Inlet Port Connection Type NPT, Operating Pressure - Maximum 13.3 psi, Operating Temperature - Maximum 250 Degrees F, Operating Temperature - Minimum -65 Degrees F, Relief Type Proportional Relief, Vacuum Maximum 28 in Hg, Vacuum Minimum 0 in Hg