500 DFU Stack Air Admittance Valve Adapter For PVC Schedule 40 Straight Vent 3 To 4 Inch 160 Branch Black White Finish ASSE 1050 1051 Compliant DIY Friendly DWV Plumbing

500 DFU Air Admittance Valve Adapter for 3-4 in PVC DWV
✔️ ASSE 1050/1051 compliant, 3-4 in vent, 160 branch, black/white unit

The 500 DFU Stack Air Admittance Valve Adapter is a venting accessory designed for PVC Schedule 40 DWV systems. It serves as a secondary vent for 3 to 4 inch vent lines in residential or light commercial plumbing, helping to equalize pressure and prevent trap siphonage.

✅ 500 DFU rating for venting DWV up to 4 in (76-102 mm)
✅ Opens/closes as needed by the plumbing system (secondary vent)
✅ 3-4 in (76-102 mm) vent compatibility with 160 branch
✅ PVC Schedule 40 straight vent adapter, black/white finish
✅ ASSE 1050/1051 compliant, DIY friendly installation

💡 What is an air admittance valve used for in plumbing venting? A quick rundown helps explain how it works. - Provides a handy vent for DWV systems when roof vents aren't available - Opens to admit air and closes to prevent sewer gases - Compatible with PVC Schedule 40 straight vent adapters - Ensures ASSE 1050/1051 compliance for safe operation