The Direct Cartridge Holder can be used instead of the regular guard cartridge holder. As it screws directly into the column, no connecting tube is required for connection to analytical column. 

All guard cartridges are compatible with both the Direct Cartridge Holder and the older Guard Cartridge Holder, as long as the I.D. is the same.

I.D. Cat. No. PKG size 4.6 mm 19989-71 1 PKG

A Guard Cartridge Holder (or the above Direct Cartridge Holder) is required to use guard cartridges.

I.D. Cat. No. PKG size 2.0 mm 11884-71 1 PKG

For connecting COSMOSIL columns

I.D. Cat. No. PKG size 0.1 mm 12570-41 1 PKG 0.25 mm 37843-69 1 PKG