Straight service valve to toilet cistern: replacing with 150mm flexible hose

MM · 2021-05-20T12:59:23+00:00

The cistern service valve is very slightly weeping and so will have tobe replaced. But in order to remove the valve I shall have to cut offthe ferrule at the compression joint end. As it is unfeasible toactually saw through the ferrule, the usual approach is to saw throughthe pipe just past the ferrule. But then the gap between the cisterninlet and the new service valve is likely to be too large.So what about fitting a 150mm flexible hose instead? There are severalavailable, on eBay, on Amazon etc. These have a compression joint atone end and the usual coupling at the other end to screw onto thecistern inlet. They are available with or without an integralisolation valve. I would only choose the latter kind.I've fitted compression joints successfully before, but have neverused the flexible hoses for anything, so have no experience with them.But surely the compression joint end is just like any othercompression joint? Should just be the case of using a pipe cutter tocut the existing copper pipe, then fitting the hose? The onlycomplication is that the builder painted the copper pipe white tomatch the bathroom! But paint stripper should remove it. Plus wirewoolperhaps.I assume one would attach the hose to the cistern inlet first, inorder to gauge the right distance to cut the copper pipe for thecompression end?Am I on the right track here?Thanks.MM

May 20, 2021 Last reply: 5 years ago 22 Replies

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MM 5 years ago

I don't understand how it can start leaking, though. Going back through my records it was October 2015 when I fitted a new fill valve, and it's been leak free until a few days ago. Does the fibre washer perish in some way? The old one looks pretty ropey, I must say. It almost fell apart.

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Fredxx 5 years ago

It sounds a poor quality. I would expect it to last longer.

I can't really think of a plausible explanation for the failure.

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Roger Hayter 5 years ago

I've only seen them fail when the two fittings are not perfectly aligned so that, immediately or over time, there was unequal pressure on opposite sides of the washer, and the washer was squeezed out at one point.

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