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Author:
GaryA (NM)
This is my current sink/disposal drain set-up. It drains OK and there are no functional problems, but I'd like to do it better. I suspect the trap isn't to code because of the transition from plastic tubular to the larger PVC and then back to the plastic again. I also don't like the center tee arrangement and would rather have an end waste tee. For the trap, a regular plastic p-trap won't work because of the height of the drain. The drain is exactly 1-1/8" lower than the disposal outlet.
I am considering the following options:
1. Get rid of the disposal (but my wife likes it).
2. Cut the trap adapter off of the drain, use a 1-1/2" PVC coupler and a PVC 90 connected to a PVC p-trap. I kind of like this idea. It would fit, and would have about a 3" seal depth.
3. Use a regular plastic p-trap like a Keeney 400PVCK, reversed so it will fit. The seal depth would be about 4", maybe slightly more.
Suggestions, comments, rants?
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Author:
packy (MA)
i wouldn't touch anything..
you have a cleanout at the wall, you have a cleanout at the bottom of the trap and the trap is removable. just be careful to run lots of water when you use the disposer and keep the water running for a few seconds after everything is ground up..
if you really, really, really want to change things then cut off the adapter at the wall and put a schedule 40 "Y" and 2 traps..
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Author:
hj (AZ)
You SHOULD have an end outlet waste, because your disposer is pushing water past the tee and into the other drain,a but you will have to convert it to Sch. 40 piping to do it, because tubular will need more space than you have.
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Author:
protech (FL)
I would do nothing. There is very little wrong with your setup. Technically, the P-trap is larger than the trap arm it dumps into but if you have never had clogging issues I wouldn't even fool with it.
Remember, if it ain't broke, you can always fix that
Edited 1 times.
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Author:
GaryA (NM)
This is a great forum, thanks for all the replies.
hj - when I changed out the disposer, I noticed the center tee is baffled, so that's good, but I think the end tee would be better anyway.
The Insinkerator Badger-1 that was in there for 5 years started leaking, so I replaced it with the Waste King 111, which so far seems to be a nicer unit. I read a lot about problems with the Badgers leaking.
Edited 2 times.
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Author:
GaryA (NM)
Oh, this is bad, I'm answering my own question (but I'm not talking to myself, yet). I found this on another forum:
"The desanco fitting (or trap adapter) has shorter threading and a tapered interior edge to mate with the desanco washer. The male adapter is not tapered on the inside and has a longer thread shank. Both will work as male adapters. A male adapter, on the other hand will NOT work as a desanco without tapering the interior."
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Author:
GaryA (NM)
Well, upon further inspection it looks like what I thought was a PVC trap adapter is actually a thinner-walled adapter of some sort. It has no markings so I don't know what it is, but it doesn't have the usual markings that you see on a PVC fitting. It actually looks like the trap adapter they sometimes include with a plastic p-trap. So, I'm not sure if the UPC and/or IPC codes would allow putting a female PVC adapter onto it.
Got any ideas on this?
edit: I think the trap adapter is a DWV part and not sch 40 PVC.
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Author:
GaryA (NM)
I found out that the threads on a trap adapter are usually straight and the threads on a PVC adapter are tapered, so my idea to screw a female PVC onto the trap adapter probably won't work.
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Author:
GaryA (NM)
OK, here's the final result. It turned out pretty nice, eh?
It's not too easy to see, but there's a male/female adapter connection just off the waste tee. I put that in just in case my plan didn't work out as well as I thought, so I could just unscrew it and do something else if I needed to. As it turned out, everything worked as I thought. As you can see, I had just barely enough room for the plastic tee (with maybe 1/4" to spare).
Overall drop from the disposer output to the wall tee is about 1-1/8" to 1-1/4". I think with anything less than 1", you would have to go with a different design, or open the wall and lower the waste tee. With a disposer outlet only slightly above the level of the waste tee, you might be able to tee the PVC and use two separate traps, just maybe.
BTW, if you were wondering, there's about 1/4" in 12 slope on the disposer output tube.
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