Speedaire 4ZL05 Lockout Valve

Speedaire 4ZL05 Lockout Valve is an inline safety device for compressed-air systems that allows maintenance personnel to isolate a line during service. It features 3/4-inch NPT inlet and 3/4-inch NPT outlet connections and is rated for up to 300 psi, making it compatible with standard industrial pneumatic circuits. This valve is designed for lockout use to prevent air flow when work is being performed on a line, helping to ensure depressurization and a secure maintenance environment. The model is listed as Speedaire 4ZL05, a Grainger-branded lockout valve with 3/4 in NPT connections and a 300 psi maximum operating pressure, and current listings note it has been discontinued by the manufacturer. Common applications include isolating air lines on air compressors, pneumatic tools, and other plant equipment to support safe servicing and line maintenance.