Guard Column fo rPrepHT XDB-C18


We have purchased the preparative Cartridge column (PrepHT XDB-C18; P.N: 977250-102) with two end fitting kits (P.N: 820400-901). It is noticed that guard column is in part of the preparative column according to the manual. May I know if the guard column is also required to purchase separately and which guard column would be appropiate for use? Besides, is it necessary to install guard column for use?

Thank you.

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