Guard column for the Premier Carbohydrate column 220-91208-66. Recommended to prolong the lifetime of the analytical column. Requires a PEEK or stainless steel column coupler. Use stainless steel coupler 220-91524-97, or either PEEK coupler 220-91524-98 (with tubing and fittings) or 220-91524-99 (1-piece with double ended 10-32 stems.)