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Air Vents
Armstrong Air Vent
Cast Iron Fixed Pivot Ball Float Air/Gas Vent Model Model 21-AR 1/2 inch npt, 23 psi, 3/16 inch orifice
Armstrong Fixed Pivot Air Vent
Cast Iron Fixed Pivot Ball Float Air/Gas Vent Model 21AR 1/2-in NPT, 92 psi, 3/32-in orifice
Armstrong order no D500248
Armstrong Air Vent
Cast Iron Fixed Pivot Ball Float Air/Gas Vent Model 21AR 3/4 inch, 17 psi, 7/32 inch orifice
Armstrong Air Vent
Cast Iron Fixed Pivot Ball Float Air/Gas Vent Model 21 AR 3/4 inch, 92 psi, 3/32 inch orifice
Armstrong Part No: D500036
Armstrong Air Vent
Cast Iron Fixed Pivot Ball Float Air/Gas Vent Model 21AR 3/4 inch NPT, 1/16 orifice, 250 Psi, 4.12 oz Float Weight
Armstrong Air Vent
Cast Iron Fixed Pivot Ball Float Air/Gas Vent Model 21AR 3/4 inch npt, 5/32 Orifice, 33 PSI
Armstrong Air Vent
Cast Iron Fixed Pivot Ball Float Air/Gas Vent Model 21AR 3/4 inch, 9/64 inch orifice, 41 psi
Armstrong Part No: D515553
Armstrong Air Vent
Cast Iron Fixed Pivot Ball Float Air/Gas Vent Model 21AR 3/4 inch NPT 1/8 inch Orifice 52 Psi
Armstrong Part No: D505649
Armstrong Air Vent
Cast Iron Fixed Pivot Ball Float Air/Gas Vent Model 21AR 3/4inch with 5/32 orifice
