First time pool owners just bought an Intex 18 round. We also purchased a Hayward thru the wall skimmer but keeping the cartridge pump til next year. We are confused on how to make the plumbing work without leaks and having flexibility. Got to have a valve in there somewhere too. The 1.5 to a 40 mm diameters using the hoses that came with the pool. Any help would be greatly appreciated!