Taco 418 hy vent 1 2 female x 3 4 male float style automatic air vent 150 psi brand. The coin vent features special hygroscopic cellulose discs in the valve body when dry the discs allow air to be released from the system 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. 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.
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