Laceygirl and Punninya I'm not sure if its any help but I ditched the intex plumbing a couple of years ago, never looked back, it was awfull stuff.
http://www.troublefreepool.com/thre...immer-on-Rectangular-Intex-Ultra-Frame-UPDATE
THIS link was a great read on what others did and how it worked out! What a wonderful group of people to share their experiences and knowledge here!
Kim