GL38 caps seal to the bottle with an O-ring (EPDM) which is resistant to commonly used HPLC solvents. If improved chemical resistance is required (e.g. for halogenated hydrocarbons), order an FEP-coated O-ring separately.
One port is suitable for 1/16" tubing. All other ports can fit 1/8" and 1/16" OD tubing. A bottom-sealing barbed adapter to connect a 1/8" (3.2 mm) ID tubing can be ordered separately. Unused ports should be closed with 1/4-28 plugs.
Color-coded PP sleeves fit on all ports on 2 and 3 port caps. With 4 port caps, the use of PP sleeves is limited to two sleeves per cap. (Four colors are included.)