Anyone know what these are?

[awm_1]

I found these in a set of tools I purchased with a set of tool boxes. I think they might be for aircraft fuel system maintenance, because they are brass and some aircraft decals in the box.

Thanks for any clues,
wayne

 

[November X-ray]

Those appear to be "non sparking" sockets, not necessarily for aircraft but commonly used in potentially hazardous atmospheres such as natural gas, propane, butane work etc.

 

[ranch23]

I would bet the large one fits the large plug on a 55 gallon drum. Maybe one of the others fits the small plug.

 

[Ghoulardi]

Those appear to be "non sparking" sockets, not necessarily for aircraft but commonly used in potentially hazardous atmospheres such as natural gas, propane, butane work etc.

YUP !!!

 

[OldMachinist]

Scroll about halfway down on this page http://www.thecarycompany.com/containers/tools/drum_wrenches.html

 

[tripletap3]

I would bet the large one fits the large plug on a 55 gallon drum. Maybe one of the others fits the small plug.

Also known as a "bung" that screws into the "bunghole".

 

[awm_1]

Thanks everyone, I have been wondering about these sockets for months.