Just bought a large DE filter on ebay for my 15'x 48" intex. I like overkill. Planning on hard plumbing a hayward skimmer thru the wall. Ive seen some informative posts here on that but most of the pics are unviewable. Any suggestions with regards to preventing leaks? Has anyone used silicone in conjunction with the butterfly gasket? Should I cut the gasket in order to make it 2 piece so I can cut the hole thru the wall after installing skimmer, or just put the whole gasket on the inside of the wall? Any tips would be appreciated.