Might be a stupid question, but I have an existing outside tap, which I might be getting moved. Inside the house the pipe that serves the tap tees off a cold water pipe and goes up vertically a short way before existing through brickwork. The cold pipe that it tees off continues on to a dishwasher. the length of vertical pipe from tee to exiting the house is just about 15 cm I guess. Would there be an issue to leave that small leg in if tap is moved i.e. i guess its a small dead leg. e.g. legionella. Or does that leg and the tee need removing. Thanks.