Stop and Waste Valve Lead-Free 3/4" 76-LF, 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) 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. Straight, ½” FIP x ½” FIP.