What do I need to connect the waste to the drain? Just a piece of 40mm pipe & a nut?

[AVR2]

The is under our kitchen sink, the small sink next to the big one. The previous owner had connected the sink to the drain with the bits in the second photo, which are too long and force the drain pipe down at an angle and leave the rest of the waste pipes cocked and occasionally leaking.

To my untrained eye, it looks like all it needs is a single piece of 40mm pipe cut to the right length, with a compression nut to attach it to the bottom of the sink?

Or should I do away with the 90-degree elbow coming off the main waste and put a flexible connector in there?

 

[endecotp]

Normally these parts would originally come as a kit like this one:

McAlpine Double & 1 1/2 Bowl Sink Kit White 40mm - Screwfix

Order online at Screwfix.com. Constructed from high temperature polypropylene with compression outlets. Suitable for double bowl and 1½ bowl sinks. Multi-fit compression outlet suits waste pipes to BS EN 1451-1-2000. Suits most UK and European sinks. FREE next day delivery available, free...

www.screwfix.com

This is adjustable by sliding the various pipes in and out of their neighbours before tightening the nuts.

Can you not get a satisfactory fit by sliding parts around?

Post a picture of the whole lot?

 

[AVR2]

Here's a video. The issue all seems to be on the vertical section coming off the small sink, which is fractionally too long. I've had it all apart and there's no scope to shorten anything.

It feels like there ought to be an option for a single flexible coupling to go between the sink and the pipe coming off the main waste?

I took a £6 punt on this from Screwfix, but while it would work length-wise when bent to the right angle, the nut is just too small to screw onto the sink outlet and the spigot end is the same OD as the main waste pipe. I still haven't figured out how to make plumbing fitting sizings make sense.

 

[endecotp]

I think that’s all mounted wrongly. The trap should be below the smaller sink, with the larger sink going into the horizontal piece.

Of course changing it would mean the outlet would be in a different place.

 

[CountryFan]

I would probably just install an adjustable trap to that and connect to th horizontal pipe if possible

 

[AVR2]

I would probably just install an adjustable trap to that and connect to th horizontal pipe if possible

Could you link me to a suitable part please?

 

[CountryFan]

Could you link me to a suitable part please?

McAlpine Adjustable Inlet 'P' Trap

• 75mm water seal• 1½" Multifit compression outlet suits all plastic, copper and lead pipe• Adjustable inlet makes trap suitable for all domestic repair, maintenance and improvement work• Manufactured in polypropylene• Conforms to BS EN 274-1:2002

www.toolstation.com

 

[endecotp]

@Stuckinarut , are you suggesting that he connects the outlet of the new trap to the inlet of the existing trap?

 

[CountryFan]

@Stuckinarut , are you suggesting that he connects the outlet of the new trap to the inlet of the existing trap?

No, I can’t see the existing trap. I thought it was one of those shoite ikea/Howdens types. In which case, an adjustable trap can still work just remove the adjustable part and fit to existing, job done.

 

[Madrab]

The problem you'll have is the diameter of the existing waste/ trap setups pipe - McAlpine comes as a kit so all the PP pipe is matched but it isn't quite 40mm if I remember, apart from the actual waste connector as that has to be 11/2". Therefore it may be difficult to get a piece to fit it.

What you have there is a cobbled together mess and just isn't correct and never will be.

Buy a new waste kit and put the trap (long adjustable side on the 1/2 bowl and then a little pipe and a bend to connect to the outflow, that's the way it should really be.

https://www.screwfix.com/p/mcalpine-1-1-2-bowl-sink-kit-trap-white-40mm/6295p

 

[endecotp]

No, I can’t see the existing trap.

You need to look at the first few seconds of the video.

 

[AVR2]

For clarity, here's the existing setup:

 

[AVR2]

So you're saying that it really needs to be installed as a mirror image of the above? The main pipe to the trap coming off the small sink rather than the big one?

With the trap being under the small sink, what should I be looking at to connect it to the pipe going through the wall? Some kind of flexible connector like this?

 

[CountryFan]

I wouldn't be fitting flexible, maybe see if a trap extension will work

 

[AVR2]

I'm trying to envisage what I'd actually need so that I'm not guessing and having to make multiple trips to and from Screwfix. If the trap is now going to be underneath the small basin, won't I need at least one 90-degree elbow and a length of straight pipe that I'd have to cut to length? Or is there a single piece that does what I'd need?