Vintage toilet - not draining quickly

[Dec27]

certainly 'trying'...

You’re trying to ruin a perfectly good thread, again.

 

[Justin Passing]

Has the look of a siphonic to me. There were a couple of designs. They're "clever" but more likely to block than a washdown
The bottom T is the right way round.

 

[elliotdavis10]

Thanks everyone. I've replaced the section of pipe up to the AAV with a longer pipe and it's still the same. I'll show a picture. It's a single storey property and nothing higher than this. It's the same when I take the durgo cap off completely.

This is a new build property- there's no problem with the pipework, it's all been inspected and all clear as far as I can see.

The toilet was second hand, but bought for the colour and the vintage look my partner was wanting for this room.. so there was no toilet here beforehand to replace it with!

 

[elliotdavis10]

The behaviour you describe is common with a syphonic WC that lacks the special valve. Take some photos of the pan from the side and the shape of the waterway may be visible

But yes, I agree, pull the Durgo off.

Does this picture help?

 

[elliotdavis10]

Has the look of a siphonic to me. There were a couple of designs. They're "clever" but more likely to block than a washdown
The bottom T is the right way round.

Are you talking about the siphon inside the cistern, or the shape of the p/s-trap underneath? I've googled and there's a suggestion that the problem may be the speed with which the water can fill the pan from above. I've put brand new kit inside the cistern so should be all ok, and there's no obvious limescale buildup or blockages in the holes that fill the pan up.

 

[Justin Passing]

Quick search on google found this with a good pic:

I 'm not sure I can give you a clean link to the top of the thread...
Copy and paste this

https://www.diynot.com/diy/threads/double-trap-siphonic-pan-help-needed.389820/#post-2997763

K

Thread 'Double Trap Siphonic Pan - Help Needed'

14 Jan 2014

Hi there, my toilet is an old double trap siphonic pan and up until last week, has worked fine for the last 27 years. When I flushed it, the cistern would flush water into the pan but it was no longer sucking the water out of the pan although the water level would stay at its own found level.

After fitting a Dudley Turbo 88 siphon along with a Syvac Aspirator it is now flushing perfectly with the suction working as it should but for some reason the water level in the toilet pan is not filling up to the level it used to.

I'm not a plumber but I do understand the toilets u bend...

• Kitten381
• Replies: 9
• Forum: Plumbing and Central Heating

The idea was that the lower trap is filled by the flush water, it overflows in a siphon way and that PULLS the stuff out of the top part of the pan.
Or a variant of that.
I don't like them, they leave stuff unwashed-down, and the valve at A gives bother.

There's a huge difference in price between a basic, council variety WC which works perfectly well, and a posh one.

These are "trade only" - so open an account, innit.

PJH B2G Rimless Close Coupled WC Pack inc. Soft Close Toilet Seat | Williams Trade Only Plumbing & Heating Supplies

The 2Go Rimless Close Coupled WC Pack (DIPT0018) is a complete toilet solution combining a rimless pan and cistern with a soft close seat, ready to spec for cloakroom, en-suite, and general bathroom installations.The rimless pan design removes the traditional rim, giving cleaner water flow and...

www.tradeonlyplumbing.co.uk

There are a few under £100, around.