45 to 40mm - which compression ISO elbow to use? DIYer

[Crimea]

I can’t work out which compression elbow has been used. I’ve only removed the sink waste elbow, but it revealed a 45mm pipe - 1 3/4 inch-ish I guess. All I I can find, though, are McAlpine ISO 1 1/4”, 1 1/2” and 2” elbows.

I’m a bit stumped, to be honest.

Any help would be appreciated. Thanks.

 

[terryplumb]

The elbow in your pic isn't a compression elbow ,it looks like a push fit. Did you just pull it off the pipe ?
Show us pics of fittings internally on that pipework.

 

[Crimea]

I’ll have to take off the tape-covered one tomorrow (the only one being replaced), as it’s too dark now, unfortunately.

I put the replacement push-fit FloPlast, that I had intended to fit, up to the outlet pipe, but it was far too small. I hadn’t realised the outlet was bigger than 40mm. I liked the idea of all the pipe work being one ‘style’, before I discovered the compression fitting was there for a reason. That’s when I started looking at ‘reducer’ fittings and found this Screwfix thread, with a similar ‘45 to 40mm’ problem. He solved it with a McAlpine MT4 ISO, but I don’t see how.

https://community.screwfix.com/threads/old-waste-pipe-sizes.244844/

The collar around the fitting definitely looks like a compression collar, but I’ll have a better look tomorrow.

I know I shouldn’t have pulled it off (gently), but because it’s so brittle, I wanted to use the least mechanical force, in case it had to go back on.

Most of the new pipe work is cut and assembled, ready to be fitted, bar this vital elbow.

 

[Crimea]

Sorry about the photo, but it is the best I can do. The bag and tape are holding the everything together. I assure everyone that it is a compression elbow.

 

[Madrab]

Get a McAlpine 40mm (11/2") elbow.

McAlpine MT4 Bend 90° 40mm - Screwfix

Order online at Screwfix.com. 40mm bend for domestic and commercial use. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

 

[Crimea]

Thanks. Won’t that be a bit small?

 

[terryplumb]

Your original pic shows a fitting without any tape ,that doesn't look like a compression elbow. The one wrapped in tape is a compression elbow.

 

[Madrab]

Thanks. Won’t that be a bit small?

That fitting will fit any 1/1/2" - 40mm waste pipe.

 

[Crimea]

That fitting will fit any 1/1/2" - 40mm waste pipe.

It looks like the pipe is 1 3/4”, though, unless I’m mistaken.

 

[Madrab]

It looks like the pipe is 1 3/4”, though, unless I’m mistaken.

All solvent weld (SW) waste pipe in the UK is either 32mm (36mm OD) (11/4"), 40mm(43mm OD) (11/2") or 50mm (56mm OD) (2"). That pipe isn't 50mm, it's 43mm by the looks of it.

Pushfit OD sizes are the standard 32/40mm but both push fit and SW will fit into a compression coupler.