Pipe a 3 way valve in , so it’s going to return , then open ball valve to give flow , this is how I have pacer booster pump for sprayer piped up , and irrigation bar. And then you don’t also have pipe under dead end pressureI did this to run an auger unload trailer for bulk fertiliser, worked well, used flat face couplings on a bracket to the side of the spreader, if you incorporate a ball valve on the pressure line you can pressure the spool, then connect the pipes before opening the valve so saving getting in and out so much. (Shut the valve before disconnecting and you are ready for the next cycle)