Once all the air is purged the discs would then come in contact with system water, where upon they would swell to create a positive shut-off This continuous cycle prevents the radiators from becoming air bound and speeds the process of filling the system Installed on water or stream radiators the Taco automatic coin vent is the ideal air purging device 416-2,,TACO, INC.,,TACO SLIM-LINE HY-VENT 1/8IN NPT 150PSI,Taco The vent can also be manually shut-off by means of an internal ball check The vents are also easily serviceable if needed, by just unscrewing the vent cap. Taco 418-4 model is a Hy-Vent series automatic air vent with 1/2" female threaded NPT x 3/4" male threaded NPT system connection ;Taco®, 418-4, Air Vent, 1/2 x 3/4 in Nominal, NPT Connection, 150 psi Working, 240 deg F, Brass, 3-11/32 in H x 1-13/16 in W Dimensions;418-3 TACO HY VENT 3/4inch MALE X 1/2inch FEMALE REPLACEMENT VENT FOR TACO VORTECH VRTX-075 VRTX-100 & VRTX-125 Taco Hy-Vents are simple, easy to use and install and compatible with any heating system. The vents are easily serviceable by just unscrewing the vent cap. Taco 418-4 model is a Hy-Vent series automatic air vent with 1/2 female threaded NPT x 3/4 male threaded NPT system connection 1/2 Vacuum Hose Hvac Positive Taco Taco 418 Hy-Vent 1/2" Female X 3/4" Male Float Style Dr. Brown's Milk Pitcher
