Shower

[Keefiedee]

I am replacing my old shower in my first floor bathroom. The previous waste pipe is vented by a long vertical piece of waste pipe into the loft space above. I have never come across this sort of arrangement before, and wonder if it is really necessary, as it's going to be a real faff refitting it once the new shower tray is in. Any thoughts? The only thing I can think of is that the shower waste pipe has about

3 metres to travel before it reaches a downpipe, so does not have much of a slope, and that the venting is to improve the flow.

Keith

[Keefiedee]

Aha! I've never noticed anti-vacuum valves at B & Q - would I need a specialist plumbing supply outlet for this?

[A Plumber]

Aha! I've never noticed anti-vacuum valves at B & Q - would I need a specialist plumbing supply outlet for this?

It's an automatic air admitance valve you need, not anti vac

[PeterC]

Just fit the HepVo trap - no water so no siphonage and no smell due to low throughput not flushing the trap.

[Keefiedee]

Brilliant - and so much easier to fit tucked away under a shower!!! Many thanks.

Keith

[Keefiedee]

I have looked at the HepVo valves at Plumbworld, (link above not working) and find them listed with two accessories - a knuckle adaptor and a running adaptor, but can find no information at to what purpose these extra parts have.

I see elsewhere that it is recommended to fit the HepVo perhaps a metre or so from the shower outlet, to reduce the risk of it becoming clogged up with soap, so I shall be fitting it horizontally. Do I need either of the two accessories to do that?

Keith

[PeterC]

Oh, I don't know why the link doesn't work. I've just clicked on it in your reply and it opened up in Opera - but that's biased ;-)

Sorry, I don't know what those adaptors are, but tere'll be an expert along in a minute.

Hepworth's product guide is here:

That's useful information, ta. If I replumb my bathroom waste I'll put 1 trap downstream of the swept tee where the basin comes in. No point at all in having 2 traps on outlets in the same room and there's no risk of one syphoning the other.

I must find out what these adaptors are!

[andrew]

The knuckle adaptor is an bend that attaches to the bottom of the shower waste and to the HepVo. The running adaptor fits to the HepVo and to pipe (compression fitting). To use horizontally right next to the shower waste, use the knuckle adaptor. To use horizontally further down the pipe, use the running adaptor. To use vertically directly below the waste, use neither.

A

[PeterC]

Pages - Download"

In the PDF and on the first link: knuckle is bent and running is straight, so running adaptors for in-line and knucle for directly under the outlet. There's also the advantage that the space under a tray isn't much even if the trap is there.

The last one that I fitted was about 9 years ago in an old GF's kitchen. It's had loads of fatty stuff throgh it and the residue from various take-away meals and has never given any trouble.

One disadvantage: if you drop something down the hole, it's gone!

[Keefiedee]

[Keefiedee]

Not completely clear - will I need a running adaptor at each end or just at the end nearest the shower - the other end being a straightforward compression fitting?

Keith

[PeterC]

If it's not in that PDF you'll have to get one and see. I can't remember now, but also I don't recall getting any other fittings with the trap but there was a plumbing shop nearby so it would have been easy to pop out for any odd bits. With those insalltion instructions, you know as much as I do.

[andrew]

The bottom end is a compression fitting anyway to go straight onto pipe, so you just need one running adaptor for the top end.

A