The only locline I've seen on the end of 1" pipe is 3/4". Compensate for the pinching with additional outlets. I run ~2000gph (after head losses) in my 110g through 4 3/4" locline outlets with flared nozzles. There's no flow restriction. You can also get Y adapters to make a dual outlet at each location if that makes it easier.
I'd get Kevin to check into that for you, but, personally, I think what you're going to find is it's 3/4" after all. But maybe I'm wrong. My suggestion, order some and find out.
