How do I extend sink drain pipe (plastic) that stops at wall?

[ahlondon]

Old chrome trap was crumbling; I'll replace with plastic. Previously, the chrome pipe (approx 30mm diameter) leading into the wall went into the wall pipe you see in photo (approx 34mm). I have 32mm pipe but it's too big to go inside wall pipe and too small to put the chrome pipe into (I thought about using it as bridge). The wall-chrome pipe section was also leaking so that wasn't very good anyway.

What are my options other than ripping out the pipe in the wall and installing new joints and pipe outside on the other side of the wall outside? The wall pipe is nearly flush and there isn't much space around the pipe but I am thinking of using one of the joining solutions below, but I fear the wall pipe will be too big as its diameter is slightly more than 32mm?

 

[mcmoby69]

11/4 solvent weld pipe and 11/4 pushfit pipe are slightly different sizes same with 11/2.

measure the internal diameter of what goes through the wall and see if you can match it.
other than that you are digging into the wall to get a fitting on to it.

 

[Hugh Jaleak]

You are going to struggle to get any sort of joint onto what's there without hacking a lump out the wall. Firstly, need to know what type of pipework you have, Solvent Weld fittings wont work on Push Fit pipe and vice versa. The rubber coupling, you wont be able to tighten the jubilee clip inside the wall so that's a non starter.

I appreciate it may be a total nightmare, but I suspect the easiest way you are going to sort this is by cutting the pipe off externally and feeding a new, (longer), section through the wall, and reconnecting it to the existing pipe outside.

 

[Madrab]

Unless you have at least ~30mm of pipe sticking out the wall then there is very little you can do to connect a basin waste pipe to it I'm afraid. If it was a basin waste then it will more than likely be a 32mm waste pipe, which is 36mm OD. Depending on the type of pipe - PP which is push fit or ASB which is solvent weld, will determine what fittings can be used.

The old chrome pipe if it was 30mm will have been European sizes which was typically 30mm OD and if it fell apart then chances are it was chromed steel rather than chromed brass/copper. That could have slipped inside a 32mm waste pipe but wouldn't be watertight and that's not the way waste pipe should be joined together.

It may need a new length of waste pipe fitted through the wall to do it properly

 

[HERTS P&D]

What about this, as long as it is solvent weld:

Andy

 

[ahlondon]

Might try this if I don't renew the whole pipe and section!

What about this, as long as it is solvent weld:

Andy

 

[ahlondon]

You are going to struggle to get any sort of joint onto what's there without hacking a lump out the wall. Firstly, need to know what type of pipework you have, Solvent Weld fittings wont work on Push Fit pipe and vice versa. The rubber coupling, you wont be able to tighten the jubilee clip inside the wall so that's a non starter.

I appreciate it may be a total nightmare, but I suspect the easiest way you are going to sort this is by cutting the pipe off externally and feeding a new, (longer), section through the wall, and reconnecting it to the existing pipe outside.

Agree with all this although I am hoping by hacking out a bit of the surround of the pipe the push fit might go in... not sure how many mm it needs though

 

[ahlondon]

Unless you have at least ~30mm of pipe sticking out the wall then there is very little you can do to connect a basin waste pipe to it I'm afraid. If it was a basin waste then it will more than likely be a 32mm waste pipe, which is 36mm OD. Depending on the type of pipe - PP which is push fit or ASB which is solvent weld, will determine what fittings can be used.

The old chrome pipe if it was 30mm will have been European sizes which was typically 30mm OD and if it fell apart then chances are it was chromed steel rather than chromed brass/copper. That could have slipped inside a 32mm waste pipe but wouldn't be watertight and that's not the way waste pipe should be joined together.

It may need a new length of waste pipe fitted through the wall to do it properly

Yes, the old chrome pipe was slipped in and is still in good condition, but the rest ws low quality like you suggested.

 

[ahlondon]

What about this, as long as it is solvent weld:

Andy

Will pipe solvent weld to another piece of pipe?

 

[avonmouth]

No........it will not weld pushfit pipe.

 

[ahlondon]

No........it will not weld pushfit pipe.

What pushfit? If I cut 2 lengths from the same pipe, can those two pieces solvent weld together?

 

[avonmouth]

It can only weld solvent weld pipe and not pushfit pipe......they are different.

 

[foxhole]

You can heat the new plastic pipe so it will fit around a section of the old chrome pipe to use as a joint.

 

[Scally-Ho]

If the pipe is sold as solvent weld, then yes it can be jointed with a solvent weld coupling and the correct SW cement.

Solvent Weld Straight Coupling

www.toolstation.com