Rotating Gate Valve Lockouts Manufactured from tough lightweight dielectric Xenoy thermoplastic these rotational valve covers can withstand extreme conditions, temperature range -46 C to 177 C • Outward/Inward rotation allows for easier installation & storage • Surrounds the valve handwheel to protect against accidental operation • 5 sizes available, each size nests within the next larger size for easy storage • Supplied with "Do Not Operate" warning message