Water Air Vent (401488) 1/2"F X 3/4"M NPT
Differential Air Pressure Switch Operating Range .07 To 12" WC SPDT
Air Vent Automatic w/Built In Shut Off 3/4 & 1/2"NPT 150 psi Max Brass
Water Air Vent (401485) 3/4" M NPT
Differential Pressure Switch - Range .15 To .5 Inches W.C. Air Filter Service
Automatic Air Vent Combination (3/4"nptm 1/2"nptf) 113021