1995 C250 Gas burner

May 30, 2014
16
Catalina 250 southeastern CT
Have a single gas burner in the "galley". Found small, 3"W, 1.5" H 10" L. device at end of gas linefeeding the burner. It is under wash basin beside the burner.
What is it? How is it used? where does the fuel for the burner go?
Was told burner no longer burns propane, but some sort of alcohol. Is this true, where do you get it and how do you use it.
Thanks Catalina C250 Hull C13