What is the connector called to attach this p-trap to an equal tee?

[vertexape]

Hello,

I am plumbing in a double basin sink based on the first pic that I mined from a Reddit thread. (happy to accept suggestions on if this is correct as well)

My waste pipe is 32mm and mounted in the floor. I will be mostly solvent welding

However when I look at the top of the p-trap, I have no idea what the name of the connector needed to attach the top of the p-trap with a section of pipe that will go into the tee.

I thought it might be a 32mm straight coupler, but it doesn't fit the top of the trap. I can only think it needs to be something like a threaded attachment to 32mm solvent pipe?

I've googled about every possible guess I can think of!

 

[Ben-gee]

Hello @Ben-gee - thanks for your reply. No it's not a kitchen sink, it's a double basin for our ensuite. So the waste is 32mm in the floor.

Ah ok thanks for clearing that up (you mentioned basin and sink in first post, I know most people use them interchangeably but to plumbers they are specific and different!)

I would still put individual p-traps on each basin and then tee them together. Would add in an air admittance valve to stop gurgling of the other basin if necessary and there was room.

 

[vertexape]

Ah ok thanks for clearing that up (you mentioned basin and sink in first post, I know most people use them interchangeably but to plumbers they are specific and different!)

I would still put individual p-traps on each basin and then tee them together. Would add in an air admittance valve to stop gurgling of the other basin if necessary and there was room.

Ha Ha @Ben-gee , I guess saying a "basin sink" is really unhelpful terminology

Thanks for clarifying the double trap setup.

So yes, I was using an image of a double sink waste kit, and trying to apply this to a double basin. Where the sink waste kit I posted is concerned, is the single trap they use in this down to a cost aspect (i.e. making it cheaper), rather than a choice or what works best?

My other question is if I added a second trap and then teed them together, where does the AAV get placed in the setup? as I assume the base of the tee would naturally go straight down to the waste pipe in the floor? I know the trap I have has a small air valve but I have a dedicated one I may as well use now!)

many thanks everyone for the advice so far.

 

[Ben-gee]

I think the rationale behind the kits is to save space in the cupboard. But the long horizontal section can lead to smells if deposits are left in it, and I personally think if the two p traps point backwards it can actually leave more usable space in the cupboard. I have this set up at home on my kitchen sink and it never blocks or gurgles (why on earth did I say that, it’ll probably explode now!)

 

[vertexape]

I think the rationale behind the kits is to save space in the cupboard. But the long horizontal section can lead to smells if deposits are left in it, and I personally think if the two p traps point backwards it can actually leave more usable space in the cupboard. I have this set up at home on my kitchen sink and it never blocks or gurgles (why on earth did I say that, it’ll probably explode now!)

heh heh. Ok thanks for explaining @Ben-gee. I have modified a cupboard to be the vanity unit under the basin (which is 800 wide) so there should easily be space for a dual trap.

 

[vertexape]

I've ended up with this drawing based on @fowlerboi and @Ben-gee 's advice.

I added some 135 Deg elbows at the base as the waste is right next to the feeds, and I want to shift it across a bit to clear some space around the tap tails.

my only concern is the traps not reaching the basin wastes as I read the AAV needs to be 4" from the main waste pipe? I might have to extend the down pipes with the adaptor that @fowlerboi recommended.

 

[Ben-gee]

Attach the traps directly to the basin wastes.

 

[vertexape]

Attach the traps directly to the basin wastes.

roger that! given I want to add an AAV and my waste joining at the floor, how should the trap outlets be spaced when connecting to the down pipe? or can I go straight to each side of a tee and then down?

 

[Ben-gee]

You can’t go to each side of the tee as one will be against the sweep.

Either use two tees, like your drawing, or use a single cross tee (has four connections) - if you use this then the aav can come off the top of it.

 

[vertexape]

You can’t go to each side of the tee as one will be against the sweep.

Either use two tees, like your drawing, or use a single cross tee (has four connections) - if you use this then the aav can come off the top of it.

Thanks @Ben-gee, learning so much through this! appreciate your input.

 

[vertexape]

Thanks @Ben-gee, learning so much through this! appreciate your input.

annoyingly I can't see anywhere that stocks a cross tee in 32mm, only 40mm and 50mm.

Is it okay to use a reducer on all inputs on the cross tee?