Simmons 1 In. Silicon Bronze Check Valve, Lead- is a high-quality check valve designed for a wide range of plumbing applications. Crafted from durable silicon bronze, this valve body and poppet assembly provide excellent corrosion resistance and long-lasting performance. It includes a buna-n O-ring, stainless steel spring, washer, and locknut, all of which contribute to reliable operation and prevent leaks. With a working pressure rating of 400 P.S.I. and female pipe thread connections on both ends, this check valve ensures easy installation and compatibility with various plumbing systems. Its lead- construction complies with safety standards for drinking water, making it an i choice for preventing backflow and maintaining proper flow direction in your plumbing setup. Model Number: 503SB