are you talking about something like this .I also know on you tube there are several video's of above ground ponds and there are a few on here in the pond construction sight
ok mine screws on is there a rubber gasket between the 2 parts .Some use pl roofing stuff to seal between them .Ponddigger on you tube used parts like that and shows the install on Rosemarys pond in California .Flange goes on the inside of the liner and the other part goes on the inside .The hole has to be cut a little tight so it is a tight fit .Where are you using it on the side or on a filter tank
That should be easy to deal with.
I would fit it into your sleepers the best you can , and flush on the inside wall.
than once the liner goes in and you like how it fits, cut the hole for the flange
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