If your summer escapes came with the 1500gph pump like mine did I don't think they make a strainer adapter that fits, they're all for smaller pumps, you have to leave the old pump on. I did and I run that old pump 24/7 (it's only 110ish watts).
My intex sand filter didn't come with any adapters. I had to buy these:
http://www.amazon.com/GAME-4550-Filter- ... B004TN6EEU
Put those on inlet and outlet to the new pump/filter and clamp on some 1.5" ID tube to them that goes to my old pump and my old return.
If you get cuffed 1.5" hoses they leak a lot less than the 1-piece-molded type that comes with the summer escapes. Edit: but if your se pool came with less than a 1500gph pump it may use smaller than 1.5.