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These are aluminum-style adapter fittings that convert a male ORB (O-ring boss) port to a male AN flare connection, in -16AN and -20AN sizes. They are aimed at plumbing radiators, electric water pumps, thermostat housings and expansion filler necks on custom and race cooling systems. The key limitation is thread reach: the short ORB threads do not seal in every water pump application, so some pumps need a dedicated conversion adapter on the housing or neck. Compared with standard-length ORB-to-AN adapters, they fit tighter bosses but demand more care in checking thread engagement before assembly.
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These adapters connect a male ORB (O-ring boss) thread to a male AN fitting. They come in -16 AN and -20 AN sizes.
Use them on radiators, electric water pumps, thermostat housings, expansion filler necks, or anywhere a -16 AN or -20 AN male ORB to male AN connection is needed.
The ORB adapters have short reach threads, so they are not compatible with all water pump applications. An appropriately sized Autoplumb Water Neck Conversion Adaptor on an existing thermostat housing, filler neck or water pump works well in most applications.
