Kevin Ricks wrote:
I want to put a utility sink in my garage. The main reason is to have
sof****er hot & cold for car washing etc. I plan on tapping into bathroom
plumbing in the basement and run pipes up and through the firewall just
above the foundation wall into the garage. I have easy access to the
basement bathroom plumbing in an adjacent unfinished utility room. I know
how to solder copper and PVC pipes etc but have never done any drain/vent
plumbing.
The toilet and sink vent are shared in sort of an 'h' configuration. There
is also a shower drain which is probably connected to that venting as well
but I can't see that. The toilet vent would be the easiest and closest for
me. I don't care about finishing the utility room so the pipes can run
outside the wall cavity.

My question is where to splice the drain for the utility sink? Can I splice
anywhere into the basement toilet (2") or bathroom sink vent (1.5") stack
without causing problems?

What measures do I take when passing the plumbing through the garage wall
(firewall)?

Garage can get cold enough to freeze I plan on putting some kind of manual
shutoff/drain valve in the basement, but I would prefer some kind of
automatic (passive) system where the pipes drain back into the house each
time the water faucet is turned off or not in use. Does such a thing exist?
(I know about anti freeze hose bibs but I do not want to use those if
possible).

Do anti siphon valves need to be permanently installed on the plumbing? Or
am I OK just using an external add-on hose bib anti siphon valve attached to
the sink faucet?

Thanks

Kevin


I think you are in way too deep.
First, you can't dump the sink drain into
any vent. It should go into the main waste stack,
but exactly where would depend on the layout of
other fixtures. Too many unknowns.

Why not dispense with the sink and just have
Hot/Cold frost-free sill cocks protruding from the wall.

Jim