Model 8200 is only compatible with the screw format indicated by the asterisk (10 mm, 2 mL, 10-425, FB). *** Specific models are only compatible with certain screw or headspace vial types. Model MPS 2 is only compatible with the headspace formats indicated by the asterisk (23 mm, 10 mL, RB and 23 mm, 10, 20 mL, 23 x 75 mm, RB).