New sink waste

Bogart · Jan 25, 2021

Am trying to get my head around plumbing in my new 1.5 kitchen sink. The waste arrangement looks complicated, to my mind at least.
Have attached photos to show how the pipework looks connected up as per instructions. I am not sure how one is supposed to do this as the pipework extends some 170mm past the rear of the cabinet. Even if I fit it 180 deg about I would not be able to shut the door! Am I missing something here. Have contacted the manufacturer who were not exactly helpful.

Gasmk1 · Jan 25, 2021

use a hacksaw to cut to sizes required

Bogart · Jan 25, 2021

Oh yes I know the hacksaw will be needed at some point. Have attached another photo showing my latest arrangement. If I cut the adapter with the dishwasher spigot this arrangement will work, well at least it is all within the sink limits though taking up a hell of a lot of cupboard space. The old 1,5 sink it is replacing, different part of kitchen uses 2 separate bottle traps which looks so much easier. I intend to use a HEPvO self sealing trap further down the line so that inside the cupboard look as little cluttered as possible. Is this manufacturer supplied setup common? If it is do they ever try them out themselves!

Ben-gee · Jan 26, 2021

You can cut more off various lengths to get it neater- but personally I would chuck it in the bin and use two p-traps!

Bogart · Jan 26, 2021

I have binned it and literally just fitted a McAlpine SK1, so much easier and takes up way less space.

Bogart · Jan 26, 2021

Now another question to you knowledgeable chaps. Attached is yet another photo this time of sink and pipework in situ. Naturally being a kitchen sink is currently 40mm. Could I reduce that to 32mm as it is quite a small sink in reality. Would make it easier as the unit backs onto another unit with barely 40mm gap between them so going 32mm would be great. And finally should I extend the pipe work a bit after the P trap so as not to turn it into an S trap which I have read are susceptible to siphonage?

Many thanks

Ben-gee · Jan 26, 2021

No don’t use 32mm pipe.

WC1 · Jan 26, 2021

Remove a bit of material with a multi tool or chisel to let in the 40. Don't go to 32 if poss. (Although tbf that's the kind of corner I might cut in my own home but never for a customer )

Bogart · Jan 27, 2021

If I use 40mm the pipework will have to go down and out the bottom of the cabinet. Not as neat as going out the back but I suppose with the door closed who will see, or care, anyway.
Final consideration is to whether to use a HepV0 valve outside the cabinet which means I would only need to cut one hole in the shelf. Only considering this as I have a 40mm valve already.

WC1 · Jan 27, 2021

Bogart said:
If I use 40mm the pipework will have to go down and out the bottom of the cabinet. Not as neat as going out the back but I suppose with the door closed who will see, or care, anyway

So crack on.👍

Bogart · Feb 1, 2021

Have done and now finished. All done in 40mm and amazingly no leaks.

WC1 · Feb 1, 2021

Well done for avoiding 32. You might have regretted it.
Maybe not today, maybe not tomorrow.

Bogart · Feb 9, 2021

One final question re this setup. It is regards the outlet to which I will connect the dishwasher. It does not appear to have a rubber washer on it but the plastic to plastic looks a good tight fit. Am I correct in thinking there is no rubber washer? It is a McAlpine SK1 kit. Have contacted McAlpine but still awaiting an answer to this.

WC1 · Feb 9, 2021

Do you mean the small bore spigot?
The dishwasher hose jams on to the plastic spigot, sometimes you have to cut down the spigot. Make sure you take out the blue insert and also use a jubilee clip.

Basher · Feb 9, 2021

Bogart said:
One final question re this setup. It is regards the outlet to which I will connect the dishwasher. It does not appear to have a rubber washer on it but the plastic to plastic looks a good tight fit. Am I correct in thinking there is no rubber washer? It is a McAlpine SK1 kit. Have contacted McAlpine but still awaiting an answer to this.

As per WC1
It's not like a tap connector - there's not normally a rubber or fibre washer - the plastic to plastic seals well enough.

Bogart · Feb 10, 2021

Basher said:
As per WC1
It's not like a tap connector - there's not normally a rubber or fibre washer - the plastic to plastic seals well enough.

Thanks WC1 and Basher that is what I will do. The 2 plastic surfaces look very smooth as if made for one another.
Thanks again.

New sink waste

Bogart

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Gasmk1

Bogart

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Ben-gee

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Ben-gee

WC1

Bogart

WC1

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WC1

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WC1

Basher

Bogart

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