I have to replace a very old slop sink in basement. It has 1 1/2" Galv pipe for drain, but it isn't vented. I am changing because my washer drains to it and has over flowed a few times,but always flows poorly. There is no clop in line,as I have snaked,but didn't help. I will be using solid PVC. If I tie drain to tee,and extend pipe 3 feet high,WILL THIS WORK? Thanks John :confused:

John , they make a under counter vent that you can try . If that don't work CUT the drain line and put ay then a 45 then a pice about 6 or 7 ft high use 1and 1/2 or 2 in pvc pipe. You can any of these parts at a plumbing store or Lowe's, home depot. Hope I could help

FLYING EAGLE ----------- I never heard of the under counter vent?? Where would I look for this at? Do either of these vents need to go to the outside? I do not want to do that. Thanks a lot John Da :)

They are called a studor vent or air admittance valve. Don't need to go outside.

Stew 1962---------- Do I have to go to plumbing supply house?? Is it PVC? Thanks :)

They are PVC, you should be able to buy one at Lowe's, Home depot, etc.

THANKS STEW!! MY HOME DEPOT IN NJ probably won't have it, not much in plumbing dept. I will try Lowe's, if some one knows what it is. Does it come in 1 1/2"?

STUDOR (R) inVENTive Technology (TM) - Air Admittance Valves (http://www.studor.com/mini-vent.htm)

STEW Thanks A LOT

STEW 1962 ---- I seem to be having problem with 1 1/2" galv close nipple that is going into a 4" saddle in my cast iron sewer main. Can I sawzal the top of nipple just below old tee ? I f so Do they make something to go over threaded nipple? Fenco? I don't want to reduce it going into main.

I don't recommend ferco-ing over top of old stuff. You really need to use the fittings and adapters as they were intended, they might work... but only for a while.

Is the nipple stuck? You might be able to judiciously use a dremel tool or a chisel to split the old nipple. I've spent hours and hours getting old pipes apart - the fix only takes about 5 minutes afterward. Seems anti-climactic, but the results are always long-lasting.

If you have a digital camera, maybe a picture will help get some suggestions for the fix. There's LOTS of good plumbers on here.

Thanks to Everyone's Advice !! Job Is Completed :D