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The 316 stainless steel UM5090 Tube Adapter inserts and locks securely into any Burnewiin mount and can easily be removed and stored, so that another accessory can be used in that mount position.
The upper end adapter socket is rough cast and accepts approximately 1-5/16" tubing or flag staff.
It can be used to fabricate any customized installation you can come up with including crab pot davits, custom bimini supports, custom barbeque mounts, etc.
NOTE — while this adapter itself is very strong, the ulitmate strength of any structure you use it for is dependent on the strength of the Burnewiin mount you select (nylon or stainless steel) and the quality of its installation and substrate. Cave fingenti (Fabricator beware).