0-4mm Replacement O-Ring Kit, TFE Stem, Kalrez, To Consist Of: 1ea: #007 2ea: #010. Each kit contains a set of three o-rings, one for the tip and two for the barrel seal. O-ring sizes are listed in the following chart. If individual o-ring is required see CG-305 for Viton or CG-308 for Kalrez.O-Ring Specifications:0-4mm: #007 Tip O-Ring, #010 Shaft O-Ring