A 316 stainless steel knurled cap and Tefzel CPI ferrule seal to 1/8" OD PTFE tubing when finger-tightened onto the precision-machined filter holder. The filter element is replaceable. Standard 10 µm porosity protects delicate pump components from particles but introduces very little pressure drop. 1/8" OD. May be used as a helium sparging diffuser.