If you have a Combi boiler then it is just a case of turn the main stopcock off and everything is off, but what about the rest of us with all those extra valves in the airing cupboard. Turned off the main stopcock, but the cold is still running in the bathroom? A common question I keep getting. Don`t fear Al is here, to explain all.
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To drill a square or rectangular hole, score the material with a scribing iron or a sharp pencil, then punch one or more drill holes right next to each other depending on the required size and drill them out.
You are best using our step drill, which is specially designed for the combitech® dimensions, and afterwards file off the corners with a rectangular file.
More information: https://products.alfer.com