Installing disposal under deep sink-pipe clearance
#1
01-10-23, 04:32 AM
Installing disposal under deep sink-pipe clearance
I am trying to install a disposal under a deep sink. I found a brand that is only 5 15/16" from the bottom of the sink to the horizontal centerline of the outlet. What is the minimum difference from the centerline of the outlet to the horizontal centerline of the drain pipe protruding from the wall so that water runs freely? I had read someplace that 1/2" would be sufficient, but I want to be sure we don't have standing water in disposal. thank you
#2
01-10-23, 05:10 AM
Group Moderator
#4
01-14-23, 12:12 PM
One other question…the trap under the sink is 1.5” ABS. It is a much heavier gauge than the black plastic found in the big box stores for kitchen drains. I need to replace the trap because the sink tailpiece was glued into it. Can I use the thinner wall back plastic trap and connect it to the heavier ABS drain pipe that extends from the wall? It is connected to the old trap with a large back nut. Thanks
#5
01-14-23, 12:46 PM
Group Moderator
As long as it fits snug. I used to run into trouble with old 1960s/70s genova cpvc mating up with today's pvc sizewise... but you "shouldnt" have trouble with abs to abs, as long as the inside and outside dimensions are OK. But you'll be wise to dry fit and check the fitment before you start gluing. Be sure you use abs or all purpose glue.
#6
01-14-23, 01:35 PM
I realize now I wasn’t using the right terminology. I have an ABS trap and drain pipe. The trap must be removed as the sink tailpiece is glued into it. I was wondering if I could attach a new black polypropylene trap to the existing ABS pipe that comes out of wall and has a flared end that would hopefully screw to the new polypropylene trap.
#7
01-14-23, 01:41 PM
Group Moderator
We'd probably need photos of what you have. Sounds like you need a new tailpiece as well. To put a slip joint trap into your wall you'd need a SJ adapter.
#8
01-14-23, 03:41 PM
OK. The simplest thing seems to be to use a whole new polypropylene trap. The disposal has its own tailpiece. If I cut the ABS horizontal pipe that goes into the wall and glue a slip joint adapter to it,will the 1.5” polypropylene pipe slide through the adapter and into the ABS? In other words, is the OD of the PP small enough to slide into the ABS?
#9
01-14-23, 03:50 PM
Group Moderator
SJ adapters come in 2 sizes... 1 1/4 and 1 1/2. So if you have a 1 1/2 sj trap, it will slip into a 1 1/2" sj adapter.
