Pipe and elbow wanted for kitchen sink drainage

[muckington]

Greeting!

Have one of these

https://www.screwfix.com/p/flomasta-round-p-trap-white-40mm/590jn

It say its 40mm. however my outside pipe diamitor is 44mm and its slack and wont compress in the compression fitting!

Also have one of these

https://www.screwfix.com/p/floplast-push-fit-bend-black-90-40mm/32151

Again says its 40mm. But now the fitting is to small for the pipe

Can anyone help me out please? as i need a pipe from the U Bend trap to the hole in the wall with an elbow bend

Thanks

 

[Wayners]

Push fit won't fit solvent pipe.

 

[robinbanks]

Compression fittings on traps work with both solvent and push fit pipe. The rest of your system piping should be the same kind as the pipe you're trying to fit onto (as Wayners points out, push fit and solvent weld pipes are different diameters and aren't directly compatible without specific couplers to go from one to the other)

 

[avonmouth]

Any pipe,push fit or solvent will fit that trap but not that elbow.Swap the elbow for a compression one.

 

[muckington]

Compression fittings on traps work with both solvent and push fit pipe. The rest of your system piping should be the same kind as the pipe you're trying to fit onto (as Wayners points out, push fit and solvent weld pipes are different diameters and aren't directly compatible without specific couplers to go from one to the other)

are you saying i need to add glue around the pipe before i compress it into the trap

 

[muckington]

Swap the elbow for a compression one.

do you know what size i need?

 

[avonmouth]

do you know what size i need?

40mm...no glue needed

 

[muckington]

40mm...no glue needed

thanks!
Ill go and buy one now

 

[robinbanks]

are you saying i need to add glue around the pipe before i compress it into the trap

No, on a compression fitting like a trap you jput the pipe into the fitting without glue. When you wind the screw to push a shaped rubber washer into the gap around the perimeter of the pipe it forms the seal.

Remove the screw collar, the plastic slip ring and the rubber washer, and fit them to the pipe first, in that order, then put the pipe into the fitting and slide the items up to the joint 1 by 1 to see how it works/check all is well aligned, then tighten it up

 

[muckington]

No, on a compression fitting like a trap you jput the pipe into the fitting without glue. When you wind the screw to push a shaped rubber washer into the gap around the perimeter of the pipe it forms the seal.

Remove the screw collar, the plastic slip ring and the rubber washer, and fit them to the pipe first, in that order, then put the pipe into the fitting and slide the items up to the joint 1 by 1 to see how it works/check all is well aligned, then tighten it up

I got a reducer for it, but it wont thread with the o ring in place

Also the sizes are all wrong, says 40mm compresion, but the pipe it fits is 44mm OD

 

[robinbanks]

Also the sizes are all wrong, says 40mm compresion, but the pipe it fits is 44mm OD

40mm is just marketing-speak. Solvent weld 40mm has an OD of 43, push fit 40mm has an OD of 41. Compression 40mm is loose enough to accept either, because it's squashing the wedge cross-section rubber washer into the gap that creates the seal

40mm is just to distinguish it from the other sizes of waste, eg 32mm and 50mm, which also have push fit, solvent and compression variants, none of which are exactly 32mm or 50mm

 

[muckington]

40mm is just marketing-speak. Solvent weld 40mm has an OD of 43, push fit 40mm has an OD of 41. Compression 40mm is loose enough to accept either, because it's squashing the wedge cross-section rubber washer into the gap that creates the seal

in my limited experance there are 2 micky marketed 40mm's. one big and one small, and they do not cross match over different fitting

 

[Razor900]

Also the sizes are all wrong, says 40mm compresion, but the pipe it fits is 44mm OD

That's the difference between pipe and tube. Pipe denotes the nominal internal size of the pipe but tube refers to the OD.

This is why 3/4" iron pipe has a larger bore than 22mm copper tube.

Also as already said there are different plastic waste pipe types which aren't compatible so they are made a slightly different size to stop people mixing them up.

 

[dilalio]

Probably wickes waste... A law unto themselves!