fun with 38mm od pipe

38mm (1.5 inch) outside diameter pipe is a pipe size that you come across when dealing with flushpipes. Is it used by anything else ?? And cistern outlets usually have a compression fitting for this size of pipe, and the flushcone to connect to non-direct-coupled toilet pans fits this size pipe. Most plastic plumbing pipes are 1.5mm wall, so that 32mm pipe is 35mm od, 40mm pipe is 43mm od, and 38mm od is too small for 40mm compression fittings and too large for 32mm compression fittings (marley etc). So if you need to make connections in 38mm pipe (e.g. where the other option is a flexible cistern to pan connector), you are stuck. Almost. I needed a dogleg since the cistern must be offset, and I've heard bad reports about the flexi pipe (water pressure moves it and connections become loose). So I went to get a highlevel flushpipe to use the dogleg from plumbcenter, which turned out to be crap, with the dogleg being wonky. However, it also turned out to have a 32mm id / 35mm od pipe that pushed down with interference fit into the 38mm od pipe so the overall length could be adjusted. Interesting. That would be fine for a flush pipe, since its not under much pressure for any length of time. It also came with an adapter to convert the cistern outlet compression to a 32mm od flange. So I will do this: connect 32mm (35mm od) standard pipe into the L bend (38mm od, 35mm id) flush pipe just by pushing it in with a decent overlap, connect 32mm pipe at the top using the special flange, and use an adjustable 32mm connector and the variable length overlap to get things lined out without pulling on the flush cone or weedy and rather bending plastic concealed cistern I got. Phew ! But anyone know of fittings available to fit 38mm o/d pipes ? Any make of 40mm compression that will seal up to 38mm pipe ? I am amazed the bodgery required to do such a simple job. Cheers, Simon.
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Just one of the reasons to hate plumbing.
Dont forget the hairdryer & cone option.
NT
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On 08/11/2010 13:36, sm_jamieson wrote:

I was faced with replacing a flush pipe and the connectors at each end. My local plumbers' merchant sells a straight coupler for this 38mm pipe. I bought one of those just to get the fitting from one end of it to connect the flush pipe to the cistern - the syphon actually. This was part of a cistern saga which is still on going - see my post below?
Frank Stacey
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wrote:

What was the connector like ? Compression ? Black rubber tube with jubilee clips ? Simon.
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On 09/11/2010 13:45, sm_jamieson wrote:

I got it from Plumb Center. It is described as 1.25" STRAIGHT MULTIFIT CONNECTOR S28M. Search on the s28m finds it. Don't know why it says 1.25" as it fits flush pipe exactly. Frank
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wrote:

Are you sure your flush pipe is 38mm od ? That makes no sense. 1 1/2 and 1 1/4 seems to be just another name for 32 and 40mm, s28m is macalpines compression fittings. Maybe they just tighten up further than marley ones. Simon.
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Sorry, you said 1.25 connector. Maybe you can just force the 38mm od pipe in. I could not with the marley ones from B&Q. Simon.
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