The Sentry guard column holder is required for use with Sentry guard columns that have an I.D. of 3.0, 3.9, and 4.6 mm and a length of 20 mm. This kit also contains a column joining tube assembly which allows your holder to connect with the analytical column. The Sentry guard column holders can be used with any HPLC column regardless of the manufacturer. Replacement o-rings (WAT023401, 2/pk) can be purchased to ensure a leak-free connection.
