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If the washer drained above the sink connection it would wash the vent for the sink, since the laundry vents before that it can go below the sink. Both vents are tied together above into 1 vent.

Depends on the code, in NC any time pipe is run through a foundation wall it must be sleeved.

What about one of these?

http://www.pexsupply.com/Plastic-Bend-Supports-523000

http://www.pexsupply.com/Metal-Bend-Supports-524000

I want to add a washer/dryer, but there isn't anything correct about my current DWV system. The house was built in 1972, so instead of adding onto shoddy work, I want to replace it all and make it...

I know they make double combo fittings that can take two horizontal inputs, but I want to use one that takes an input from horizontal and vertical.

They sound the same to me?

As long as you are within 42" from the trap to the vent I would do it like this:

Trap -> Wye (on its back for the vent) -> then tie into main stack with san-t.
...

Streets and elbows just as good? What's the advantages of using closet bends?

Can you reccommend a plumbing supply place that might be nationally known, or just go to my local building supply?

Does Lowes carry closet bends? I went yesterday to pick up some stuff for the washer/dryer rough in and I didn't see a single piece labled "closet bend".

What if the upstream is just a cleanout?

Is a spigot bend similar to a street?

If I wanted to go down about 12 inches after the toilet flange to avoid have to cut joists, can I just use a piece of pipe and a coupler into a wye combo?

Similar to this, but the combo would be...

That's what I'm looking for!!! Thanks

Not sure if this will help or not, but seemed pretty good to me. Not sure on the core drilling part though.
http://www.plumbingsupply.com/adjustable-drainage-products-install.html

http://www.digipas.com/DWL-280 Specs.html

Something similar to http://www.amazon.com/Digi-Pas-DWL-280-Torpedo-Digital-Electronic/dp/B002IQ8W2C
or...

http://www.terrylove.com/forums/attachment.php?attachmentid=10967&d=1278417976

I found this picture in another thread, this is similar to what I want to do except I would go into a wye 1/8th bend...

Seems to me it would be way easier to check it with an angle finder instead of a 1" block attached to a 4 ft. level? A 1/4" block attached to a 1 foot level would work too, but the angle finder seems...

Let's say the joists are 12", could I use a coupler to attach a piece of pipe to the toilet flange to get me below the joists, then use a closet bend from there?

Does a closet bend have to come immediately after a toilet flange, or could you install a length of straight pipe to bring the closet flange below the joists?

Ahh, okay, that makes sense. Sometimes you have to really look at what you're buying in those bins because it's not always what it says it is.

I'm getting ready to starting plumbing in a washer, and I went by Lowe's and saw the 2" 180 degree p-trap, but not sure what kind of 90 (short sweep, medium sweep, long sweep) to add to it to...

I had to install a sediment filter when my pump was pulled last, and several others in my area have them too.

Let's say I have a 1/2 HP pump with black poly drop pipe, what's the suggested length that is possible for someone to lift out by their self. At what length should you get a pump puller?

Does the well seal compress around the poly pipe enough to hold it in place? Or would the shoulder of whatever adapter you use sit on top of the well seal.

Yeah, I'm using poly pipe. Your suggestion sounds good, I just thought they made an elbow for it. I guess most people these days are using pitless adapters?

Looks like I just needed to find the right word to search for. Anyone ever use Certainteed Certa-Lok Drop Pipe?

I'm assuming that you use a well ell at the top in the well seal. This prevents the pump from falling down the well? All I hear is how bad galvanized is, but the only thing I can find is galvanized...