The 1mm, 2.o Cogent HPLC Columns™ do not have compatible guard columns so we recommend our HPLC PreColumn filters. These disposable inline Filters protect the column from un-dissolved particles do not affect the chromatography. 

For the 1mm ID column with 2um particle size we recommend item number 49650-005  

Click here to view more information about pre-column filters for HPLC