Differing materials under kitchen sink

[agd202]

I’m reworking the drain pipes under my kitchen sink and have run into two issues.

1. The existing piping and p-trap under the sink all appear to be schedule 40 pvc, but the plastic tailpiece I got from Home Depot is not. Even though everything is nominally 1.5 inches, the tailpiece has much thinner walls than schedule 40 pvc and therefore can’t fit snugly into any of the schedule 40 pvc fittings. Is there some kind of adapter you can buy that can join one of these thin-walled tailpieces to schedule 40 pvc? Where can I get it?

2. I’m pretty sure the tailpiece from HD is polypropylene – not pvc. Can you cement polypropylene to pvc? Do you need a special cement?

3. And as long as we’re at it – what about differing materials under the kitchen sink, generally speaking. Is it kosher to mix and match different materials – ABS, PVC, polyethelene, metal – under a kitchen sink or is that some kind of code violation or generally bad idea.

Thanks!

 

[phishfood]

I would use glue on trap adapter to the horizontal section of the drain pipe, and then use a tubular P trap after that. That makes it very easy to snake the line in case of clogs, or to reconfigure the drainage if you ever change sinks, etc.

 

[KULTULZ]

I’m reworking the drain pipes under my kitchen sink and have run into two issues.

1. The existing piping and p-trap under the sink all appear to be schedule 40 pvc, but the plastic tailpiece I got from Home Depot is not. Even though everything is nominally 1.5 inches, the tailpiece has much thinner walls than schedule 40 pvc and therefore can’t fit snugly into any of the schedule 40 pvc fittings. Is there some kind of adapter you can buy that can join one of these thin-walled tailpieces to schedule 40 pvc? Where can I get it?

2. I’m pretty sure the tailpiece from HD is polypropylene – not pvc. Can you cement polypropylene to pvc? Do you need a special cement?

3. And as long as we’re at it – what about differing materials under the kitchen sink, generally speaking. Is it kosher to mix and match different materials – ABS, PVC, polyethelene, metal – under a kitchen sink or is that some kind of code violation or generally bad idea.

Thanks!

You need a trap adapter- PP to PVC

 

[agd202]

Trap adapter sounds like the answer! Thanks!