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I've been retrofitting an existing PVC irrigation system around my house. Part of that work requires that I work in shallow holes adding T joints and elbows in places where there were none before. In an effort to measure twice and cut once, I've been assembling the system without glue to make sure I have the layout correct. More often than not however I'm running into issues separating the slip joints and pipes despite the fact they aren't yet glued.

What's the best way to separate these joints? Should I be applying some sort of lubricant beforehand (that won't affect gluing later on) or is there a trick beyond forcing things? With too much force I'm afraid I'm going to break pre-existing joints or mangle the existing fittings.

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up vote 6 down vote accepted

The best lubrication I've found is some good ol' Elbow Grease™.

Elbow Grease

Actually, you should measure the proper lengths and just cut. Then glue it up and install. You can mark on the PVC how far it should go into the fitting if you want to be really precise. However PVC itself expands and contracts a lot with temperature change and is fairly flexible anyway. So, in my opinion, being extremely precise doesn't mean all that much anyway. Also, The solvent melts the PVC surface to weld them together, so the fittings will likely fit differently while gluing, thus making the dry-fit method even worse than just measuring.

Another solution could be to mark how far in the fitting the piece should go and lay them next to each-other in that position, even tape them together, to check your layout. That seems pretty time-intensive, though. I still think it would be better to just measure accurately and double check your measurements.

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Decker is right on with this - when you dry fit, the pipes may not go all the way into the fittings. – Eric Gunnerson Feb 18 '13 at 3:09
PVC fitting are also tapered which makes it hard to get the pipe all the way on when dry fitting (as well as taking them apart after). In addition, if you get any dirt/grit in the hub of the fitting, it will be that much harder to take apart. If you're having a hard time using just your hands, you an use a hammer to tap on the face of the fitting. Do this lightly and go all around the circumference of the fitting. If you hit too hard the fitting will misalign and get harder to remove. – pdd Feb 18 '13 at 20:37

I think just cutting the pipe and gluing it together is the best way to go in your situation. Dry fitting can still be hard to removed, as you've discovered! Also, PVC solvent does not melt surfaces to weld joints together. In fact it's easily unglued, should it ever need to be.

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PVC pipes are NOT easily unglued. It requires specialty tools, and the destruction of the pipe. – Tester101 May 6 '15 at 11:07
PVC can be unglued without specialty tools, though they sure make the job easier. The pipe is NOT destroyed, in fact after ungluing it's ready right away for a new pipe to be glued in. More here, if you're interested: pipedebonder.com – Travis Griffith May 6 '15 at 16:25
the pipe debonder is the specialty tool, and it does destroy the pipe. It saves the fitting, not the pipe. – Tester101 May 6 '15 at 19:05

Try using a heat gun on the un-glued, but stuck connections. Also, if you need to un-glue a dried connection, using the heat gun gently warm the fitting until it can be pulled away. I've found this to be very effective.

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Hello, and welcome to Stack Exchange. It isn't clear what you're trying to say here; reformatting and making it into full sentences would really help. Thanks. – Daniel Griscom Dec 24 '15 at 14:02
Heat expands cold retracts heat to pvc will eventually soften the pipe and fitting enough to let the two separate but the integrity of the pvc will be compromised instead of dry fitting lay the sequential pieces in full fit position a few at a time using the inset marking with sharpie – Pam Dec 24 '15 at 23:37

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