Gate Valve Lockouts Make locking out valves safe and easy with these Gate Valve Lockouts. Available in five sizes to fit valve handles from 1" to 13" in diameter. Made of durable, non-adherent plastic to resist chemicals and hot and cold temperatures. Stainless steel hinge design for extra strength and security. Unique knockout feature accommodates OS&Y or "rising stem" gate valves. Designed to accept all locks with up to 3/8" shackle diameter and 3/4" or greater vertical shackle clearance. Now available in four colors to correspond with ANSI A13.1 pipe color code scheme. Use red and green devices to indicate if valve is locked in open (green), or closed (red) position. Use green for non-hazardous liquid, blue for non-hazardous gas and yellow for hazardous gas or liquid.