PVC repair couplings - gluing technique?

[Stephen Tashiro]

PVC fittings are said to seal because their openings are tapered and the usual gluing technique fuses the pipe to the fitting. But how do PVC repair couplings ( e.g. https://www.lowes.com/pd/charlotte-pipe-4-in-x-4-in-dia-pvc-schedule-40-hub-repair-coupling-fitting/50053715?cm_mmc=shp-_-c-_-prd-_-rpe-_-google-_-lia-_-142-_-indoordrainage-_-50053715-_-0&kpid&store_code=1158&&k_clickID=go_1793722707_69617672592_346854608540_a ud-299487635170:pla-373362212539_c_9030610&gclid=CjwKCAjwpuXpBRAAEiwAyRRPgSRTUZ4gikxAqXEsEj4y L-8XYeqvP28wGyiVqWN1H94BfTSejbrbWhoCf1kQAvD_BwE&gclsrc=aw.ds) seal? My understanding is that a repair coupling will temporarly slide completely over one pipe and then be slid back to overlap two pipes in order to hold the two pipes together. Does the usual gluing technique seal such a joint reliably?

[Al Launier]

Yes it will.

[Paul F Franklin]

I have found them to work OK, but they are a little tricky to install and you only get one shot. You have to slide the coupling (dry) all the way on one pipe, apply a heavy coat of solvent to the two pipe ends, and quickly slide the coupling to its final position in one smooth motion, preferably with a 1/4 turn rotation to help spread the solvent. If you stop in the wrong place, it's cut out the pipe and do over as the coupling will seize quickly in the wrong place. You can get PVC solvent with that sets a little (very little) slower and that helps. Mark the pipe so you will know when the coupling is in the right spot.

There are a couple of things working against getting a good weld: you can't apply solvent to the inside of the coupling and the sockets aren't tapered. But the weld surface is large and DWV pipes aren't under much pressure, so the couplings usually work OK. Still, I avoid using them if I can, but sometimes there is no other practical solution.

[Frank Pratt]

A good trick to extend the working time of PVC solvent cement is to apply a coat, wait a few minutes until it's just dry to the tough & then apply another generous coat & put the joint together. I think with one of those repair couplings, I'd do a third coat before assembling.

[Jerome Stanek]

Make sure you mark the half way point before you glue so you know if the fitting is in the right spot

[Bob Glenn]

I have used a slip over rubber repair sleeve with several hose clamps. Easy and reversible but more costly than PVC.

[George Bokros]

Bob has the best solution and the only I would do it. No leaks is worth the extra cost to me.

[Bruce Wrenn]

You can get a repair coupling that has a threaded locking ring and rubber gasket at each end Take locking ring and gasket off one side, and slide them over pipe, along with body of coupler. Do the same for other side, minus the couple body. Center body over repair areas, and slide up rubber gaskets and tighten locking rings. You can also get a version that solvent welds on one end, and has gasket and locking ring on the other.