The Amphenol 20-80646 is an accessory collar from the Sine Systems line, built as a Polypropylene (PP) component meant to thread onto a circular connector body or backshell. The Polypropylene body gives it good chemical resistance for washdown environments, though the exact thread size and compatible connector series are not listed in the basic spec sheet. This is a service-part number you order to complete a connector assembly, not a standalone interconnect.
Sourcing the 20-80646 for Your BOM
This collar ships in Bag packaging, which is typical for low-volume service parts and field-replacement kits — not a reel or tube for automated assembly.