It is inflexible, very hard to get on any fittings and absolutely impossible to get off. What more - it gets permeated too, no matter what anyone says.
It sounds like you're talking about the PVC pipes for sprinkler systems. The Spa Flex hose I saw is flexible just like West Marine's, but I didn't know if it was permeable. Both of the responses answered my question though. West Marine's is also PVC. Thanks!