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Its 1/4"npt. so you can use a standard air hose fitting to pressurize the system. You can not relocate IPR due to the multi-ports and duties it performs. It's basically an electro-magnet mechanical dump valve so it has 2 ports, a supply and a return.
I do have one that includes a high pressure hydraulic hose and high pressure valve. I also have a regulator to pressurize it off of my welding bottles to find those leaks that only show above the shop air, 300-600 psi.