Brass hex nut used to retain the air line ferrule on the Hobson KS Telegauge fluid reservoir.
For use on many American and English cars of the late 1920’s and 1930’s including the following:
1929 Bentley
1930’s Riley
1929-31 Rolls Royce 20/25
1927-29 Rolls Royce PI
1929-35 Rolls Royce PII
Material: Brass
Finish: Natural
Thread: 3/8-26
Hex: .500
Hole in center: .192
Height: .375
