OK, I'm confused. I'm plumbing two 1" returns back to my 210 gallon tank. This seems to be pretty standard from what I've read here. I drilled and installed two 1" bulkheads that are threaded on the flange side so I can screw in loc lines. However now that I'm looking at loc lines, all I see are 1/2" and 3/4" fittings. I don't understand why there aren't 1" fittings to screw into the bulkhead. What am I missing?