Attached is an image of two Nemo Air quick disconnectors. Image of quick disconnect on the top is the old connector that needs replacing. If you notice it does not have a ring around the metal area. The bottom image is the current connector that should be installed by a Mares authorized technician. The current connector has a ring around the connector in the metal area. If you have any questions whether you have the correct fitting, please consult your nearest authorized Mares retailer.