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Bristan thermostatic mixer

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Luggsey

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Hi all, just installing a Bristan mixing valve.
On the hot and cold inputs it has non return valves that have a fibre washer between the NRV and the body of the valve.
Do I need to ptfe the threads as well of is the fibre washer enough?
Tried to upload a photo but there seems to be a problem with that for me today.
Tganks.
Paul.
 
Fibre washer is good enough
 

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