hi Mark
i think the bevel cut one makes more sense, if you look into the pump there is a corresponding bevel. although i don't think it will make much diference when you start tightening the nut. square cut easier/cheaper?
re the washers, all the info i have shows it under the nut ie outside the pan. copper,fibre or nylon i don't realy know i used the copper one and used pipe seal on the threads.
if the washer is used inside the pan it could mess the alignment of the tube to pump?
going back to the bevel cut seal in the pump i looked at three pick up tubes and thought they were all a tad short. i believe the tube should go past that bevel in the pump by about 1/2". if the tube is too short there is a possibility that the rubber seal could partially close down the end of the tube?? i'll have to experiment
just some thoughts to play with
stuey