Guard column for any Raptor Polar X analytical column with 2.1mm ID. Recommended to prolong the lifetime of the analytical column. Free-turning architecture lets you change cartridges by hand without breaking inlet / outlet fluid connections — no tools needed. Pack of 3, requires EXP Holder REST-25808. Pore size 90A, surface area 130 m2/g, pH range 2-8, maximum temperature 60C, maximum pressure 600 bar/60 MPa/8700 psi. Pack of 3, requires EXP Holder REST-25808.