I am currently hard plumbing my new sand filter to my 16x48 Intex pool, including adding a thru wall skimmer. I have done a lot of research on this before starting the project, which led me to join this group. I'd like to thank everyone for posting such valuable knowledge.
So I'm adapting 1-1/2" PVC to the intex fittings. As many have pointed out, Intex uses non standard thread size. I have made a discovery that i haven't seen anyone post yet. I cut the thin plastic Intex hoses off flush with the (non standard thread) fittings and found that the 1-1/2" PVC fittings(coupler,elbows ETC) will slide onto the Intex fitting. Its a tight fit, and you'll have to be quick once the cement is applied. It helped a lot to "dry fit" each one into the fitting first to kinda "pre-taper" the intex fitting.
This eliminates some adapters and shaving fittings that others have done.