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hectorb3 posted on r/airguns1w
This filter would work great with your GX pumpto fill the tank for your Dad: GX-PUMP Professional-Grade High Pressure PCP Air Compressor Filter with Pressure Maintaining Function- 5800PSI Oil/Water Separator, Magnetic or Screw Mounting https://www.amazon.com/GX-Professional-Grade-Compressor-Maintaining-Function/dp/B0DX73QM4P?ref_=ast_bl_cpl_dp