Adjustable Butterfly Valve Lockout This lockout device works by jamming the valve lever release trigger. Place the device between the valve lever and release trigger and hinge open until the two parts wedge in place. Use a adjustable cable lockout (not included) to secure the device in place by passing the cable around the valve body and through the device padlock holes. Valve Handle Slot: • Min:1-1/16″ • Max: 1-27/32″ • Height: 33/64″