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flow and return

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12 Jan 2005
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had a combi fitted couple of weeks ago plumber could not fit rad in bathroon as could not get access due to old rad nxt to bath (LONG STORY!!) he has left 2 tails with iso valves on going to put rad in now how do i know what is flow and what is return one pipe has red tape on any help[ appreciated
 
connect them together and the flow pipe will be the first one to get warm. Why does it matter though?
 
The iso valve will have an arrow on the body, they should both be facing up if installed correctly. but worth checking.

The red tape is usually the flow
 

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