The Master Lock No. 481 Rotating Gate Valve Lockout Device features a 38mm depth and 38mm stem opening for 51mm to 12,7cm diameter valve handles to surround the valve operating handle to protect against accidental valve opening. The unique, patented rotating design allows for easier installation in confined space applications. Tough, lightweight, dielectric Zenex™ Thermoplastic body withstands chemicals and performs effectively in extreme conditions. Includes high-visibility permanent safety labels.