I've seen a lot of people asking how to dry fit PVC. Because PVC uses an interference fit it isn't truly possible to dry fit the fitting and the pipe. The pipe is designed to be a very tight fit as it bottoms out in the fitting. This creates a very strong bond between the fitting and the pipe once everything cures.
The easiest way I have found to measure out how long of a piece of PVC I need is to follow the steps below.
1) Cut the pipe nice and square and chamfer the edge to 10-15 degrees on one end and measure the overall length of the pipe.
2) Clean the end of the pipe and fitting with rubbing alcohol and make sure it is dry. At this point I put vinyl gloves on to keep everything nice and clean. Make sure the end of the pipe is free of gouges, grooves, etc.
3) Prime the fitting and the pipe.
4) Apply solvent to the fitting and the pipe.
5) Insert the pipe into the fitting and turn 1/4 turn and hold it tight together for 30 seconds. This is necessary to prevent the solvent from pushing the pipe out of the fitting.
6) Measure the pipe from the unfinished end to the edge of the PVC fitting. Subtract this length from the original length of the pipe and that should give you an idea of how deep the fitting's socket is.
In one case, I was using Dura (commonly sold at Home Depot) 1" Sched 40 fittings and the elbow and tee fittings were 1 1/8" deep. However, the couplers weren't as deep. Only about an inch or so.
Pretty simple.
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