Hi i am wanting to replace a couple of radiator valves the trouble is i dont want to drain the system if possible. i have heard you can buy a spray that freezes the pipe for about 20 mins while you work on the radiator is this true
you can also be overzealous with the freezing agent, overexpand the water and burst the pipe - as happened to me recently when changing a stuck gate valve on a CWSC mains feed. had to use another freezing kit to repair the damaged pipe!
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