How do you separate PVC pipes?
Heat softens plastic, so pointing a hair dryer or heat gun at a PVC joint may soften the plastic enough to allow you to pull them apart. Like tapping joints apart, this is a long shot — a desperate measure for a desperate situation. Keep the heat on the joint while you pull steadily on the pipes to separate them.
Can you Unglue PVC pipe?
When you need to repair or replace a piece of PVC pipe or a fitting, you may be interested in learning how you can unglue PVC. Unfortunately, you cannot unglue PVC. You could twist apart the pipe and fitting before the cement has set, cut off the joint with a hacksaw, or heat up the joints.