Fits Needle Valve & Air Saliva Ejector Jet Assy Cartridge (A-dec® #010.002.00) (pkg of 10) Retaining Ring, External, .18 I.D., to fit A-dec® Century® II Needle Cartridge; Pkg of 10 Fits air saliva ejector jet assembly & 22.0370.00 needle valve A-dec® and Century® are a registered trademark of A-dec, Inc. DCI has no affiliation with A-dec and A-dec has not authorized DCI replacement parts to be used on or in connection with A-dec® products.