Plumbing in kitchen sink waste (Blanco- odd size waste kit)

[drives]

Hi all,

I have a Blanco kitchen sink that I need to install, and it came with a waste kit.

I have noticed however that the outer diameter of the waste pipe is a few mm narrower than the standard "40mm" solvent weld pipe I have used for my waste run behind the cabinet. Photo attached (bottom one is what came with the waste kit and top one is ABS pipe I used)

It is too narrow for a compression fitting to tighten up on it. Is there some kind of fitting/converter that I can use for the transition?

Thanks

 

[Daveydub]

Does it not finish with a fitting which will accept a standard 1 1/2 trap?
Photo of complete kit would help

 

[CountryFan]

When you say too narrow, is it slack?

 

[drives]

Thanks.... I think I've figured it out (or part of it). The nudge above resulted in me having a proper look in one of the kits I've been sent and there is indeed a coupler so that side of things is sorted.

The instructions though I cannot work out. I've been sent the drain kit which is this one:

And then also a double sink one which is this:

I am guessing I just blank off one side of the bottom kit? I don't really get why it all came with the sink and I have the top kit with one waste outlet, and then another kit which is clearly designed for two. Seems a bit odd?

 

[Daveydub]

Do you have a single bowl with overflow and do you want a pop up waste ?

 

[drives]

No it's a double sink. One overflow, with the pop up wastes.

 

[Hugh Jaleak]

Standard 40mm Trap e.g. https://www.screwfix.com/p/mcalpine-tubular-p-trap-white-40mm/75915 should fit the outlet provided on the Waste Kit. Bottom twin bowl waste kit isn't required.

 

[drives]

Thanks- I suspected the main thing causing me strife trying to work it out, is that the fittings provided are rather over complicated. Strange kit to supply with the sink I have.

 

[Hugh Jaleak]

Probably down to whoever is packing the things, has little idea about how it all actually bolts together....

The twin bowl kit would require individual wastes fitting to each sink, onto which that would then join.

 

[Daveydub]

Does that black elbow unscrew from the sink fitting leaving you a 1 1/2 thread to accept the 2 bowl kit? Doesn't look like it but your picture doesn't show that bit very well.

 

[drives]

Does that black elbow unscrew from the sink fitting leaving you a 1 1/2 thread to accept the 2 bowl kit? Doesn't look like it but your picture doesn't show that bit very well.

If you mean the connection here between the black piece directly under the pop up waste, and the white elbow....

Yes that comes apart. I spoke to the retailer today in fact (a separate issue is that one of the pieces is broken so I need to get it replaced) and they said that I should just keep the black parts of the top kit, do away with the rest, and connect this directly to the double sink waste kit in my second image above (the one with the yellow dishwasher waste attachments and u bend).

It is a ridiculously complicated kit to send out with a sink it seems. I don't really get why I don't just have the top kit, and then a simple single inlet trap as Hugh Jaleak linked above.

 

[Hugh Jaleak]

If you mean the connection here between the black piece directly under the pop up waste, and the white elbow....

View attachment 400256

Yes that comes apart. I spoke to the retailer today in fact (a separate issue is that one of the pieces is broken so I need to get it replaced) and they said that I should just keep the black parts of the top kit, do away with the rest, and connect this directly to the double sink waste kit in my second image above (the one with the yellow dishwasher waste attachments and u bend).

Did they say how?

Slight issue of the outlets from the Black waste sections being 90° out from the vertical sections of the Trap kit, and even then are the connections compatible?

 

[drives]

Yes. Recommissioning the two white plastic elbows in the ‘top’ kit, and even then they are different pieces/lengths. Just seems such an untidy solution all round, and the sink was not cheap.