Plastic smaller bore soil pipe

[23vc]

Doing my lad’s bathroom at the mo, and the WC is currently piped into grey plastic soil pipe smaller than the usual size, which I am guessing (possibly incorrectly) is likely to be 82mm pipe. It’s pretty inaccessible and boxed in internally, so I’ve not been able to see any markings or measure it. It looks like 1980s era push fit.

I need to connect a new WC to it, and am trying to work out the right pan connector to use. I’m seeing both a macalpine 3 (for 3.5” pipe) and a macalpine 3C (for 3” pipe). I get a bit lost thought as I’m not sure if this refers to inside/outside diameter or is a reference to cast iron sizes.

Anyone done this same thing before and know the right pan connector to get? Cheers.

PS - I know I could measure it after taking the old loo out, but I’d rather already have the correct part ready to go when I do that nice task…

 

[foxhole]

Buy 82mm adapter and keep in packaging so you can return if not needed .

 

[23vc]

Yeah that’s what I’m struggling to find. Pan connector which goes from standard pan to 82mm pipe rather than pipe to pipe adapter which I don’t think I’ve got room for

 

[HERTS P&D]

McAlpine Macfit WC Straight Connector

Rigid WC pan connector for use with 4" (110mm) pipe. Manufactured in EVA with synthetic rubber and moulded finned seals. MACFIT incorporates a new 'lock ring' inlet seal to give superior, tighter connection to WC pan outlets. Suitable for all 4"/110mm PVC-U and cast iron soil pipe.• 3½"/90mm...

www.toolstation.com

Andy

 

[Ivor Windybottom]

Generally any waste pipe shouldn't get wider as it flows, not narrower, otherwise you'll get blockages.

You should have a look along its path, it probably connects to 110mm at some point. If so the job's expanded, replace it all and do it properly.

It's possible that what you're looking at is just the old pan connector or an extension, not the actual pipe. If so it needs replacing anyway, definitely don't re-use it as it won't seal.

 

[Justin Passing]

Google " pan connector 3 1/2" ".
There are loads, though some are makes you never hear of.

 

[23vc]

McAlpine Macfit WC Straight Connector

Rigid WC pan connector for use with 4" (110mm) pipe. Manufactured in EVA with synthetic rubber and moulded finned seals. MACFIT incorporates a new 'lock ring' inlet seal to give superior, tighter connection to WC pan outlets. Suitable for all 4"/110mm PVC-U and cast iron soil pipe.• 3½"/90mm...

www.toolstation.com

Andy

Oh cheers, that says 90mm but I guess that’s the outer diameter. ? I’ll grab one of those hopefully do the trick

 

[23vc]

Generally any waste pipe shouldn't get wider as it flows, not narrower, otherwise you'll get blockages.

You should have a look along its path, it probably connects to 110mm at some point. If so the job's expanded, replace it all and do it properly.

It's possible that what you're looking at is just the old pan connector or an extension, not the actual pipe. If so it needs replacing anyway, definitely don't re-use it as it won't seal.

Deffo looking at actual pipe, like I say, it’s 80s era grey push fit branch, elbow etc all visible. Ripping it out is a mahoosive effort involving multiple rooms. I believe it probably does covert to 110mm somewhere further down tho.

 

[Ivor Windybottom]

Can you measure its circumference, e.g. by wrapping a bit of string or wire round it then measuring its length?

Divide by PI (3.141) to get the diameter.

Alternatively position two straight bits of wood parallel either side and measure the gap between them.

You can't guess or estimate the diameter of a pipe just by looking at it, unless you're really familiar with whatever size it actually is.

 

[23vc]

Can you measure its circumference, e.g. by wrapping a bit of string or wire round it then measuring its length?

Divide by PI (3.141) to get the diameter.

Alternatively position two straight bits of wood parallel either side and measure the gap between them.

You can't guess or estimate the diameter of a pipe just by looking at it, unless you're really familiar with whatever size it actually is.

Almost certain it’s 82mm, which as far as I can make out does/did exist. The actual fittings look exactly like today’s 110mm stuff, just scaled down.

 

[denso13]

Almost certain it’s 82mm, which as far as I can make out does/did exist.

100mm stack is the minimums nowadays, if you want to follow the rules. Never seen a connector less than 90mm, which is for 3½" cast iron.

 

[Ivor Windybottom]

I've seen 82mm used for a vent pipe, just as it's less ugly if you need it on the outside of the building. Not sure whether it was ever intended to carry jobbies and bog paper.

 

[23vc]

Turns out the whole lot’s done in 3” plastic, I opened up the internal boxing and it goes down into a cast concrete pad a couple of feet under the ground suspended timber floor. Gotta be original from the late 70s when it was built. Anyone else come across this? I still think I’ll redo the toilet branch section (my merchants has the 82mm stuff) to try and get less bends and an access point.

 

[Exedon]

Never used it on a domestic property but back in 70s I worked on a number of CLASP buildings (basically prefabs) mostly schools.
They regularly had 3in soil pipes particularly on the horizontal sections.

 

[23vc]

Never used it on a domestic property but back in 70s I worked on a number of CLASP buildings (basically prefabs) mostly schools.
They regularly had 3in soil pipes particularly on the horizontal sections.

It’s the horizontal bit that worries me.