WC internal overflow syphons

It's not marketing hype but the difference is they're shorter - 7" rather than 9.5" or thereabouts (off the top of my head)

Not sure I could spare 9.5" off the top of my head.

"New" in geological time :-)

In days of yore, operating

Au contraire, I think it would work

The problem I find with

On the other hand a badly placed overflow/warning pipe can be pissing away for ages without being spotted - particularly during winter if people don't go wherever it's located.

harry :

Didn't we discuss this some years ago? I came to the conclusion that you can divide the population into two groups: those that would never notice, and those that can't fail to notice. With a female/male bias, for fairly obvious reasons.

The problem I see is when you have both a blocked loo and an overflow. And don't anyone suggest that Murphy doesn't have that one well in hand :-)

Chris

Our university bogs (1960s building) couldn't be ignored. The overflow was central, external and didn't require outdoor plumbing as it was mounted conveniently over the sitter's head!

Worst of all was our house in N Ireland. Cistern on an inside wall, so the plumber (an inbred halfwit with vestigial gills) merely led it into the cavity and stopped there!

Well that would solve the 'not noticing it' problem ;-)

What caused me some doubt originally was on-line shops who repeat the internal overflow claim for Dualflush Siphons but don?t stock the smaller sizes or only stock one size.

JonMcD

I've found these to be very easy to install & adjust & they seem very reliable

Thanks for the suggestion, but I've gone off cable operated flushes. It was the cable sticking that stopped the drop valve seating in the first place. We have hard water and I assume limescale build-up on the cable was to blame since once I'd taken it out and operated it a few times it freed up. Think I'll stick to lever operation from now on.

JonMcD

Didn't follow the link but if it's the fluidmaster flap valve the one (first and last :-|) I fitted was bloody fiddly.

Flap valves are OK for furriners I spose, but agin nature & no good will ever come of them...