The nut has Hubbell 3″ C UL US Stamped into it.
There is a yellow gasket conceled under the nut.
The yellow gasket at the locking ring shows in the photograph.

It appears similar to Killark K30091

Liquidtight Applications:

Use with metallic and non-metallic conduit to seal out water, oil, and dust.
In applications for food processors, beverage, and chemical plants, plastics fabricators, machine shops.

Liquidtight connectors are also suitable for use in hazardous location applications
when installed according to NEC Articles 501.10(b), Class I, Div. 2
Suitable for use in Class I Zone 2 applications) 502.10 and 503.10.
Consult these articles for sealing requirements that may apply.

See similar here K30091 for more information (opens in new window)

See similar here K30091 for more information (opens in new window)

See similar here K30091 for $400.11 (opens in new window)

Please look at photograph carefully. Information is from online research and may not be reliable.

The item is new. There is a spot of rust visible in the photograph.

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