I am a brand new home owner and first time poster! This is my first major project and I'm naturally struggling to comprehend all of the code (Michigan, US). So, I apologize in advance for my ignorance in plumbing :) . I [B]really[/B] appreciate the help. In my new house, there are not currently provisions to drain the washing machine. I would like to locate it in the basement, right near the main drain pipe coming from the upstairs. If acceptable, I'd like to splice into this drain pipe and add a standpipe for the washer. There is also a sink drain from the basement bathroom that is spliced into the main drain at the same location that I'm considering. I've found the appropriate dimensions for the standpipe/trap. From my understanding, the drain needs to be 2" pipe with the P-trap 6-18" inches above floor, a standpipe height of 18" to 30", and with the washer indirect connection located above the washer fill line. However, I'm very unsure about venting. I've seen in the code that every trap must be sufficiently vented but I'm struggling to comprehend what constitutes as a appropriate (wet?) vent. I have drawn a quick diagram of my situation. Can anyone be so kind as to help teach me what an appropriate vent for this setup would be? Thank you SO much. :confused::help::p [ATTACH]67645[/ATTACH]

I have had a back flow preventer on my out door faucet for almost 10 years. The preventer is leaking now. The problem I have is I can not take it down to replace it, I can only turn the preventer loose about 1/3 turn, then it stops and can not turn any more. There is a hole on the side of the preventer, looks like a lock hole, but it is all rusted. I can not tell what the hole for. Is there a way to take the back flow preventer down ? Thanks.