By inlet, do you mean an inlet for gas?
As for the o-ring, custom o-rings from mcmaster are $9, so that is another $20 for a bowl.
Yes my cp bowl on my 250r puma has two inlets on it with three floats. Once you figure out the size and length you need try a place called seal source in Portland Oregon all they do is seals, o rings, pistons, and what not I go in there a decent amount for putting together kits for hydraulic cylinders and motors.