This is for 610-PO10, 610-PR10 and 600-PO10, 600-PR10 Series.

2 micron 0.063" dia., 1 µL Volume, Pack of 5, goes with 610-4025 for 610 series and 600-0001 for 600 series Inlet filter housings.

If you see more back pressure than you expected, then you may try 600-2010, Inlet Straight thru hole fitting.