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Plumbing advice...

1866 Views 8 Replies 5 Participants Last post by  Dal300

I'm designing the space beneath the sink in my new wet bar cabinets and would like to offset the tailpiece to put the p-trap in the back. This would give me space for an extra drawer.

I've seen some expensive offset drain tailpieces, but I wonder if anybody has tried piecing something together with regular PVC? Perhaps something using 45 degree elbows? Any problems you foresee?

Any advice would be appreciated!
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Cosmissniper, you can use regular PVC pipe and fittings to construct a p-trap and it will work. However, you need to consider whether your state or municipality has provisions in their plumbing codes to allow such a configuration because p-traps, by design, are meant to come apart at some point before the piping goes behind the wall or down to the floor. Some p-traps come with a clean-out device manufactured into the bottom of the "U" shape and some municipalities require specific use of those p-traps in certain installations. Either of those situations will make a p-trap fabricated from regular piping and fittings illegal to install.

If there is no code governing your work, have at it. Remember the reason why the codes establish particular methods and materials: because it makes servicing easier and provides safe, efficient use.

Hope this helps, good luck!

(PS: I was a licensed plumber prior to joining the army, feel free to ask anything else.)
Thanks for the advice! I have existing plumbing, with everything you described, so I wouldnt be doing much except angling the tailpiece toward the back so that I could place the p-trap behind the drawer.
thats what i was going to recomend
just take the drain back and then put a regulation p-trap
flat against the back

you can still get it apart if needed

if you have to make the drawer shorter to allow for this
it really shouldn't be a problem
even a cut out in the drawer back would work
(with sides of course)
Thanks, David. As it is, the p-trap just extends far too low, and the bar sink sits so close to the front that about 60% of the vertical cabinet space is wasted. I wanted to make sure that it I did angle the drain toward the cabinet back and put the existing p-trap along the back, that I wouldn't end up regretting it. It makes me wonder why people continue to design kitchens and bathrooms with p-traps hanging directly underneath the sink. It's wasted space.
sink cabs are always a mess

maybe a narrow drawer to each side
and a small tilt out for sponges and things
or just leave that blank
Sink plumbing is done so that it is easy to install and repair. Making it inaccessible will cause big headaches if it needs to be repaired. A plumber will do what he has to do to get to the pipes and it will cost you more.
Ron: Yeah I get that. This would just be moving the p-trap to the back (not directly under the sink) so that I have some room to add another drawer. If I need access, I can just remove the drawer. It's not behind the cabinet or anything crazy like that.
Many years ago they use to use a brass canister as a trap just before the sink drain met the cast iron main.
It always had a 2" plug in the bottom as a clean out.

I loved those old houses my dad use to buy. I could make $100/summer salvaging those copper brass, lead, bronze and cast iron fittings. That paid for my school clothes!

Then I found out I was getting slave wages for the salvage work and I still had to buy my own clothes and school supplies!

Boy, my dad was smart!
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