Posted 6/11/2021 06:23 (#9052802 - in reply to #9052715) Subject: RE: Hoses for pto pump on semi truck
Some pumps can be run either as a single or a dual line. Lastbpump we installed was that way., IIRCA, there is a sleeve in the pump as you mentioned that blocks a port when used as a single line. Best bet is to call a dealer that sells that pump or Google the pump model.
If new the installation manual will have instructions as how to plumb both ways.