How to Align PVC Pipe Fitting During Assembly

Marking PVC pipe before gluing to align during assembly.

When gluing PVC pipe together, dry assemble the pieces first to make sure they align right, then draw matching lines on both the pipe and fitting at each joint with an indelible marker.

Disassemble the pipes and fitting, apply glue to each joint, and align the marks when reassembling for a perfect fit.

If you discover that one of the pieces of pipe isn’t long enough after it’s glued together, cut the pipe in half, and glue the two pieces back together with a coupling to make the pipe longer.

Watch this video to find out more.

Further Information

Joe Truini: PVC pipe has been a real boon to do-it-yourself plumbing projects, because the pipe is easy to cut and to assemble.

Danny Lipford: What we’re using it for today is to add a new run to our central vac system to another part of the house.

Joe Truini: The two most important things to remember when working with PVC pipe is, first, always dry assemble the parts before you glue them together. And make sure that the parts are aligned, so the pipe goes exactly where it needs to.

Danny Lipford: Now this is very important, because the glue that you use to put the PVC pipe and fitting together dries almost instantly, so you don’t have a whole lot of time to work with.

Joe Truini: That’s right. And so the key to remember is after you dry assemble the parts, just take a marker and make a line on the fitting itself and the pipe section. And this way when you go back to reassemble it, all you have to do is line up the two marks, and you know the pipe is properly aligned.

Danny Lipford: And if in the event that you have a little problem with it, and you don’t get it quite right, you can still cut the pipe very easily, put a little coupling in here to make that final adjustment.


  1. I need to glue PVC pipe together, so your tips for doing this is really good to know. One of my main concerns was whether I should apply the glue to the pipe before assembling them together. Dry assembling the pieces before gluing them seems like good advice. I can see how that would be important since it allows me to see if my pipe pieces align correctly. Now that I know to do that, I’ll make sure to avoid gluing my fittings right away.

  2. I’m new to DIY – is there a slower drying glue for PVC fittings? The ones I’ve been using dry almost immediately and I need approx 30 seconds to align the joints after applying the glue. Thanks in advance for any advice guys. Regards – Andy.


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