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Thanks Andy - appreciate the response. Supplementary daft question if you don't mind - how do I ensure no air locks? Thanks.

Hi I changed a shower pump as the old one gave in. I turned off the gate valve at the hot water cylinder and the gate valve at the cold water tank in the loft for safety. I can't remember how much of a turn the gate valve for the cold tank took to close. The hot water was multiple turns -...