ORG-234 is Cuno
for their proprietary Tank ( UNIFLEX ) and Adapter.
Also MacClean and Aqua Pure brands
- which 3M bought out, and then discontinued the design.
Common for MacClean / CUNO Valve body / adapters. ( Note most older models before 2000, used standard threaded tanks - no adapter ).
Previously sold through Aqua Pure ( Aquapure ).
A few Autotrol and Clack Valves ( sold by AquaPure ) would have this size o-ring ( instead of the larger size o-ring used on standard valve to tank connections .. threaded tanks ).
O.D. = 3 1/4" x I.D. 3" x Width 1/8"
* # 5 in this diagram,NOTE: We can NOT provide the Uniflex Tanks, nor the adapter parts ( collar, clamps, or clip that holds the clamps together ). No TANKS - No # 7, or the adapter # 5 ( o-ring ) is used on / with. All proprietary / obsolete items.You must contact manufacturer ( or authorized dealer ) directly for those items.
See FAQ article for more details about UNIFLEX tanks - Uniflex Tank Replacement Options