We have a 3" pvc waste pipe going to our septic tank. I wish to connect another line to this pipe from a guest house. The line is buried.
I can dig up and expose a section of the existing pipe, but don't know the best way to make this connection. The existing pipe will not move, so I cannot simply glue in a Y connection using normal PVC fittings. Are the rubber slip connectors appropriate for this?
If necessary I could (big job) dig up the line all the way from the new connection to the tank. Can the existing pipe move in and out of the concrete tank so I could use glued fittings?
Thanks
You could use PVC unions, about $50 each. Or you could use PVC couplings ... the kind that don't have the locating ring inside, about $5 each.
..or your could use rubber connections if your codes allow. I try to avoid them.
Looks like the proper term is "repair coupling" .. and the price is about $10.
Thank you for your help, JRR. Now I need to find out what is available at my local plumbing supply.
- John
I hope it helps. I've become very fond of using unions in drainage and water supply piping. Yes, its a bit costly and requires extra planning and installation labor. But unions can make future repairs and reworks much easier. Just imagine how the drain pipe under a kitchen or bathroom sink can be an easily removable "manifold" if a few unions are included. No cutting required. A blessing as your muscles get older.
I think they are called a "hubless" coupling as well... having had to find one after getting busted for a rubber coupling. Have 2 pairs of hands and work FAST.
True enough about the need for speed. Another tip, have a visible target that will give you comforting knowledge that you have somewhat centered the coupling across the joint. Not some target that the coupling will need to touch, but a measured distance target. I use a Sharpie mark on the pipe 2" away from the desired location of coupling edge. 2" is far enough away to avoid the cleaner, primer and glue operation: but close enough that I can quickly "eyeball/estimate" during the heat of the moment.
I also believe that a lot of glue is better than a thin coating. Seems to give a bit more time for assembly.
(With unions, there are different problems but usually not this speed challenge.)
Great info, guys. Thanks. Dug over 700 feet of trench with a ditch witch a couple of weeks back. About 100' of it was for this drain pipe. A couple of hours was spent with pick and shovel to expose the original pipe with adequate working room. Will be setting it within a week.
Would have been a much bigger struggle without your help.