The Spears PVC DWV Reducing Wye is designed to connect branch lines of different sizes while maintaining smooth flow in drain, waste, and vent systems. Made from durable PVC, it allows a smaller branch line to tie into a larger main line efficiently, making it ideal for residential and commercial DWV plumbing applications. Manufactured to meet ASTM D2665, D1784, CSA B181.2, and NSF/ANSI standards.