I've got an 18' x 48" metal frame intex pool. I just inherited a 300lb sand filter from a buddy. It has 1 1/5" standard female threads on it and I've tried a few differnt ways to hook it up (with no success.) Anyway, I stumbled across a 1 1/5" standard to Intex thread adapter and I thought I would share with those who are dealing with the same issue. Here's a link to where I got it and the part number is Intex part #34560. Hope this helps someone out....sorry if this has already been covered.

http://www.poolsuppliessuperstore.co...u-56633Ep.html