Maybe someone can help. I need to splice a 3” drain/waste pipe in a basement that is finished and i dont think i will have enough room to move the pipe side to side. Which couplings would be recommended? I noticed these four clamp no hub couplings (see attachment). Is this acceptable to use? I know you can use the pvc slip on couplings but dont like that you can only glue the pipe and not the coupling. Any info would be much appreciated.
Splice 3”pvc pipe
- Thread starter Scott1
- Start date
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First thing to know is only use standard sized no-hub couplings when you are using matching O.D. pipe, like: plastic to plastic.
Reason being that if you had no-hub fitting or pipe, those are different o.d.s so you would need special transition couplings for that.
We even use standard 2-hose clamp shielded no-hub couplings, but the four band are better/excellent and more forgiving, just be sure to tighten snugly. As plumbers we use the designated spec t-torquer tools to tighten properly.
Rolling the rubber back is somewhat more difficult with the four band, easier with standard two band.
Reason being that if you had no-hub fitting or pipe, those are different o.d.s so you would need special transition couplings for that.
We even use standard 2-hose clamp shielded no-hub couplings, but the four band are better/excellent and more forgiving, just be sure to tighten snugly. As plumbers we use the designated spec t-torquer tools to tighten properly.
Rolling the rubber back is somewhat more difficult with the four band, easier with standard two band.
Mitchell-DIY-Guy
Well-Known Member
I had to do this a couple of years ago, in the crawlspace at my weekend home in Michigan. I had added a utility sink in the garage and needed to connect the drain. Like you are guessing I didn’t have enough play in the pipes. So I carefully cut the main drain line in a perfect circular way, fabricated the piece I needed to insert, and then used the Fernco fittings as shown. After cutting out the piece of main drain pipe, I slipped the Fernco’s on either side of the remaining main drain, inserted my new piece, and then slid the ferncos back over the joints. It was pretty easy.
Attachments
I did something similar myself. Love those fittings... but in other posts, I've seen the preferred fitting has the metal band around it too.
Mitchell-DIY-Guy
Well-Known Member
I was darned lucky to find these schedule 30 parts and associated Ferncos in rural Michigan!
A schedule 30 pvc coupling or any sch 30 fitting will solvent weld into a sch40 fitting if you ever need to make a transition. FYI
Mitchell-DIY-Guy
Well-Known Member
The pipe I added, the 2” and the Wye, were schedule 40. The horizontal was schedule 30. There are sleeves on either end of the Wye to make the accommodation. Had to ask the local plumbing guy at the local hardware store (remember, rural Central Michigan nowhere near a big city) on how to fit. Apparently not the first guy to ask as they had plenty of these in stock.
