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Size 1, 2, and 3 do not require a groove. Size 4 and above tube stub is pre-grooved as standard. Generic (non-grooved) can be ordered through Quick Response Department. Sizes 20, 24 require additional lubrication prior to assembly. Add -Z6 for assembly of nuts and ferrules on the tube stub end. †All tube stubs over 1" come standard with nuts and ferrule(s) pre- assembled (-Z6 option).