well, messed that whole question up. should of put more thought into it and read tad more. guess the question could be posed to the valves.
so, two 3 qt accusumps. one is longer and holds more air for higher pressure. so i guess depends on space limitations. so, keeping it simple it would be the manual ball valve (im guessing). ill call as suggested as the electric psi ratings has me wondering about manual psi in accusump vs engine oil psi.
ty
dean