Studor 20302 Maxi-Vent 3-Inch to 4-Inch Air Admittance Valve

• For use with: Venting Single Fixture, Individual Branch, Circuit Vent Or Stack Type Application Up To 500 DFU • Material of Construction: ABS Plastic • Standards: ASSE Performance Standard 10510 And 1051, NES-592, NSF Standard 14, IAPMO, File No C-3803, ITS Intertek Testing Services • Package Dimensions : 5.5" L x 5.5" W x 8" H