The bad news is that one of the common mistakes people make when gluing PVC pipe is assuming it can be undone later. If the joint was glued properly, that's unlikely. It's all about the adhesive.

PVC pipe is a valuable material to the backyard ... The possibilities could be further expanded by combining with these PVC fittings designed just for building stuff.

One of his more interesting builds is his series on building rocket engines out of PVC pipe written in conjunction with [Chuck Knight]. For the propellent grains, the PVC rocket didn’t use the ...

is to remedy the defects of the old mode of connecting swivel elbow joints, and figure 1 of the engraving represents a section through a gas or other pipe, to which the improvement is attached ...