Jonathan Pearson wrote:
As you are using main pressure, they need to be bloody tight! - although not
recommended I've had to use mole grips in the past to get them tight enough!
Jon

Doing them up too tight destroys the washer though, the sealing part of
the fitting is quite thin so it just cuts into the edge.
Even more of a problem on those plastic Y-adapters I've found.
Better to use thicker washers than do it up too tight.

Lee
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