Universal Stopcock 5-in-1 Key Corrosion-resistant galvanised steel key in robust construction. Allows easy access to drainage systems in hard-to-reach locations. Tapered handle T-bar insert for leverage and lifting access covers. Fits 5 types of stopcock: 1/2" and 3/4" crutch head valves; and 1/2", 5/8" and 3/4" square.