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The ROYAL BUILDING PRODUCTS 35-1503 is an 8 x 4 inch PVC SDR35 gasketed wye fitting designed for gravity-flow sewer and drain applications. Built to SDR35 dimensional standards, this wye accepts a gasket seal at the branch connection, eliminating solvent welding at that joint and allowing for faster field assembly. The fitting transitions a 4-inch branch into an 8-inch mainline, making it a standard component in residential and commercial below-grade sewer installations. Licensed plumbers and underground utility contractors are the primary installers of this fitting type.
This wye fitting is used in gravity sewer main lines where a 4-inch lateral connection must tie into an 8-inch collector line. Typical install scenarios include building sewer service laterals, municipal connection points, and site utility work where SDR35 PVC pipe is the specified material. The gasketed joint design meets common requirements for flexible, root-resistant sewer connections in underground applications.
Designed as an OEM-style replacement or new-installation fitting for SDR35 PVC sewer pipe systems using gasketed joint assembly in 8-inch mainline and 4-inch branch configurations.
Installation should be performed by a licensed plumber or qualified underground utility contractor in accordance with local plumbing codes and ASTM D3034 specifications for SDR35 pipe and fittings. Ensure the trench bottom is properly bedded and compacted before placing the fitting. Lubricate gaskets with an approved pipe joint lubricant only — do not use petroleum-based products. Inspect the gasket seat and spigot for debris or damage before making each joint.
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