ITEM No: MOM#1

Designed to vent the air from the main lines, as well as on longer runs (depending on the size of the building).
Has 1/2" x 3/4" combination vertical connection. Use one or more at the end of the short main, or the main running
to the warm side of the building. Also use two or three at the end of the long main, or the main running to the cold side of the building.