Simmons 1-1/4 In. Silicon Bronze Check Valve, Lead- is a high-quality check valve designed for a variety of plumbing applications. Crafted from durable silicon bronze, this valve excellent corrosion resistance and long-lasting performance. It features a valve body and poppet assembly made of silicon bronze, complemented by a buna-n O-ring, stainless steel spring, washer, and locknut, all contributing to reliable operation and leak prevention. With a working pressure rating of 150 P.S.I. and female pipe thread connections on both ends, installation is straightforward and compatible with many plumbing systems. Its lead- construction ensures it meets safety standards for drinking water, making it an i choice for preventing backflow and maintaining proper flow direction in your plumbing setup. Model Number: 504SB