This is for Semi-Prep: 610-PO20 and 600-PO20 Series and Prep: 610-PO30-CS, 610-PO40-CS and 600-PO30-CS, 600-PO40-CS.

10 micron 0.125" dia., 4 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 the bigger porosity/diameter frit, 600-0188-10, 600-0188-20.

Notes: If you have 610-PO40-CS-1 with 5/16-24, 1/8" OD CPI port, then you need to order 610-4030 to go with 610-4025-1 housing.  If you have 610-PO40-CS-2 with 1/4-28 flat bottom for 1/8" OD tubing, then you need to order 610-4030 to go with 610-4025-2 housing.