The NIBCO stop and waste valve is a multi-purpose in-line shutoff valve for use in low-pressure, domestic water systems. The valve's screw-in bonnet offers a durable, pressure-tight seal. Constructed of high quality lead-free dezincification-resistant (DZR) silicon Performance Bronze alloy per ASTM specifications, the lead-free valve is recommended for applications that deliver water for human consumption, including commercial and residential construction.