Enhon 1-1/2 Inch NPT ABS in Line Vent, Diaphragm RV Air Admittance Valve for und
Manufacturer Enhon. Outlet Connection Type NPT. Vents can be applied as public vents or continuous vents in wet ventilation systems, provided that no more than five combined drainage units are loaded on any one vent and that installation and drainage pipe sizes comply with applicable public and wet ventilation standards.