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question about TRV tabs

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Discuss question about TRV tabs in the UK Plumbing Forum | Plumbing Advice area at PlumbersForums.net

S

se London man

my old comap TRVs hves a black tab and a grey tab, facing downwards, that can be moved up and down, next to the indicator point

does these have any role in the correct use of the TVR ? thanks
 
Min and max set I think
 

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