The OD (outside diameter) is not available from the manufacturer. They do state that the ID (internal thread) measures 1/8"-27 NPT and that it is for use with the M18™ Cordless 2-Speed Grease Gun and M12™ Cordless Grease Gun.
Milwaukee Grease Gun Couplers, 2-Pack, Model# 49-16-2649

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- Replacement couplers take the place of old or worn out couplers to get your grease gun operating more efficiently and effectively again
- 10,000 maximum PSI
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