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Do I need a washer for blanking plug in a copper hot water cylinder?

View the thread, titled "Do I need a washer for blanking plug in a copper hot water cylinder?" which is posted in UK Plumbers Forums on UK Plumbers Forums.

Hi all

I'm blanking a couple of openings in a hot water cylinder.

The Screwfix Flomasta 1" BSP plugs fit perfectly but no washer supplied or listed.

Given that the element has a washer and everything else is a compression fitting I'm concerned these should have one. The alternative is PTFE tape or La-co (as well as washer if not instead of).

Does anyone have a definitive answer please? Given the blanks will be hard to reach it's definitely a job to get right first time.
 

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