Sanborn Coleman 031-0036 In-Tank Check Valve 3/4 MPT X 3/4 Comp Inlet

The 031-0036 Sanborn Coleman In-Tank Check Valve is a replacement one-way valve designed for in-tank toilet fill valve assemblies. It features a 3/4 inch male pipe thread (MPT) connection on one end and a 3/4 inch compression inlet on the other, forming a 3/4" MPT to 3/4" compression inlet configuration. This valve's function is to allow water to flow in only one direction, preventing backflow into the supply line and supporting reliable fill valve operation. Part number 031-0036, manufactured by Sanborn Coleman, is intended as a direct replacement when this size and connection arrangement are required. Designed for use in residential toilet fill valve installations that use these connection sizes, the valve helps maintain proper toilet performance by ensuring correct fill cycles.