2 p-traps far superior than one¿ Water dripping into p-trap¿ Is the new faucet already leaking¿ I don't get it.
I pretty much followed the ideas presented here:
http://www.polaris.net/palmk/GDplumbing.html
In short, the two traps create less restriction than a tee, and the two 45's make for a less noisy drain. I don't claim to be any kind of expert, but this made sense to my plumbing-tarded mind.
I ran the supply lines for the sink and dishwasher tonight, and, fortunately, there were no leaks.
If your friend has a new home, they may have a "Johnson Tee" for the air gap. If that is the case, you would see a 3/4" PVC cap through the siding with a 1/4" hole drilled in it. It would be higher than the counter height.
This sounds a lot like what was on the exterior of our house before we tore that wall out for our addition. Out of curiosity, I'm going to have to go have a look at my friend's kitchen.
The waste fittings for a kitchen sink are 2" up to the Santee, then it can transition to 1.5" for the trap arm. Water supply tees are not used. They have to be waste fittings. The sink also uses a 2" clean out.
If I'm understanding you correctly, I need to:
1) Make all the Sch 40 stuff 2" instead of 1.5" (the vertical pipe, tee and wye)
2) Replace the slip tee with a waste fitting santee
I guess that makes sense, and shouldn't be too much work or money. That's what I get for going to Home Depot -- I'm so happy when I can find ANYTHING there closely resembling what I need that I grab it without thinking. I found out the other day that Lowes has a WAY better selection of plumbing stuff.
Thanks a lot, I totally appreciate your help. If you ever need any advice about coding or diving, I hope I can repay the favor. =)