40mm compression joints don't fit 40mm pipe

brophs

Hi,

We were having an issue with the sink earlier and I took apart the pipe, which leads into the waste pipe, where I discovered that the seal was absolutely shot. One end is threaded and then I dropped into Woodies and bought a compression fitting. I went to fit it and realised the washer/rubber seal won't fit onto the pipe. I tried the next size up and it's much too big. Am I missing something? I'm a relative novice so I might be completely oblivious to something obvious. The old seal was a clear plastic and more rigid than the black rubber seal that came with the new compression fitting.

If it doesn't work does anyone have any suggestions how else I can seal it and get it back in place?

Thanks in advance.

james2015

They are usually a very tight fit washer so try again fitting it. If not just use the clear ring washer and wrap it in PTFE tape and it should seal.

brophs wrote: »

Hi,

We were having an issue with the sink earlier and I took apart the pipe, which leads into the waste pipe, where I discovered that the seal was absolutely shot. One end is threaded and then I dropped into Woodies and bought a compression fitting. I went to fit it and realised the washer/rubber seal won't fit onto the pipe. I tried the next size up and it's much too big. Am I missing something? I'm a relative novice so I might be completely oblivious to something obvious. The old seal was a clear plastic and more rigid than the black rubber seal that came with the new compression fitting.

If it doesn't work does anyone have any suggestions how else I can seal it and get it back in place?

Thanks in advance.

corkgsxr

I'd say you have a wavin 40 mm pipe. Different trap needed.

Is the pipe black or grey

brophs

james2015 wrote: »

They are usually a very tight fit washer so try again fitting it. If not just use the clear ring washer and wrap it in PTFE tape and it should seal.

Thanks James. Unfortunately the washer is rigid and it's nowhere close to fitting. I tried paring off a small bit but it was too big. Also I can squeeze the rubber seal onto the piple but when pushed into the threaded bit it's too wide to actually pick up the threads and ends up getting pushed into the threaded end. I've seen mention of push on joints. Perhaps I could find one that's threaded on one end and has a push joint on the far end. Would they be suitable do you know?

brophs

corkgsxr wrote: »

I'd say you have a wavin 40 mm pipe. Different trap needed.

Is the pipe black or grey

Cheers for the response.

The pipe is black. Has a couple of grey elbow joints sealed/welded/glued on on the ends, as it's got the dishwasher outflow on one side and the one I'm trying to connect on the other side.

corkgsxr

brophs wrote: »

Cheers for the response.

The pipe is black. Has a couple of grey elbow joints sealed/welded/glued on on the ends, as it's got the dishwasher outflow on one side and the one I'm trying to connect on the other side.

Yep that's wavin. Might have to go to a proper plumbing place

brophs

corkgsxr wrote: »

Yep that's wavin. Might have to go to a proper plumbing place

Never straightforward.:)

I'll drop into Irish International Trading in the morning and see what they recommend. Is there anything else they'd need to know, do you think, apart from the obvious (measurements/the fittings that didn't work etc.)

Thanks again for the responses.

corkgsxr

brophs wrote: »

Never straightforward.:)

I'll drop into Irish International Trading in the morning and see what they recommend. Is there anything else they'd need to know, do you think, apart from the obvious (measurements/the fittings that didn't work etc.)

Thanks again for the responses.

Nope just say you need a trap for 40mm wavin. P or s shape

brophs

I'll do that. Thanks for the help.

Cedrus

There is no standardisation of plastic pipe, you can buy steel or copper pipe and fittings from anywhere in the world and it fits (if the spec is right). No such luck with plastic, every company making the stuff has it's own set of dimensions and what size they call it. I've had trouble with Woodies and Atlantic stuff not matching and they're owned by the same company!

If you are going in to Irish International, take in the bit you removed (was it the trap?), they're well used to it.

If you can measure exactly the outside and inside diameter of the connecting pipes , you could just go with the measurements but fractions of millimeters can count so you could be wasting your time.

brophs

Good idea, Cedrus. I'll bring it in. Would it be of any use to bring in a sliver of the pipe? We have plenty left over on the dishwasher outlet so I could just saw off an inch at the top if needs be, though I won't bother if they can work it out from the bit I'm bringing in.

corkgsxr

Cedrus wrote: »

There is no standardisation of plastic pipe, you can buy steel or copper pipe and fittings from anywhere in the world and it fits (if the spec is right). No such luck with plastic, every company making the stuff has it's own set of dimensions and what size they call it. I've had trouble with Woodies and Atlantic stuff not matching and they're owned by the same company!

If you are going in to Irish International, take in the bit you removed (was it the trap?), they're well used to it.

If you can measure exactly the outside and inside diameter of the connecting pipes , you could just go with the measurements but fractions of millimeters can count so you could be wasting your time.

Can't say Iv the same problem. Std house sizes are abs 11/4 and 11/2 and wavin 40mm

brophs

Dropped into IITC this morning and got sorted in a flash. The fella even put the joint together for me so it was as simple as screwing it back together. One fixed sink, one happy girlfriend.

Cheers, lads. Much appreciated.

Cedrus

corkgsxr wrote: »

Can't say Iv the same problem. Std house sizes are abs 11/4 and 11/2 and wavin 40mm

Well aren't you a lucky barsteward!

I've worked on jobs where we had tens of thousands of fittings that didn't match up, procurement got the best prices but one crowds 1.5 inch was anothers 1.25 inch. The OP obviously had the same problem with Woodies.
The trick is to stick with the same company for both fittings and pipe, the catch is that a DIYer cannot identify this when they are under the sink under pressure.