PROFLO PROFLO Air Admittance Valve

Product Features: 500 DFU 3" x 4" Sch 40 adapter For venting 4" DWV and smaller Includes screening on air inlets to protect the seal Made in the USA ASTM Specifications : ASTM D-2665|ASTM D-2661 Constructed of ABS - a polypropylene blend NSF Certified NSF Specifications : NSF 14