Speedaire 4ZM28A Lockout Valve

Speedaire 4ZM28A Lockout Valve is a 1/2" NPT inline air-line safety device that isolates a pneumatic line for maintenance and lockout procedures. It is rated for up to 250 PSIG (17 bar) and a maximum temperature of 150°F (65°C), with 1/2" NPT inlet and outlet connections to match standard pneumatic fittings. This valve provides a simple, reliable shut-off in industrial air systems, helping prevent accidental startup when servicing tools, cylinders, or conveyors powered by compressed air. As part of Speedaire’s line—distributed by Grainger—the unit is commonly used in industrial maintenance where quick, dependable isolation of the air supply is required. Some listings may include mounting brackets or accessories; verify the exact contents on the product page before purchasing. For best results, install with appropriate thread sealant and ensure compatible connections to maintain a leak-free lockout when engaged.