Got mine here....
https://www.mcmaster.com/#petcocks/=19xgtph
I also use the ones from McMaster/Carr I find their #4793K64 works well.
Mine had a radiator drain cock on one side.
3B9067 from CAT is $11.06 with new and improved for you convenience steel body with a plastic handle. The 4793K64 is all brass. Bob
Thank you! I’ll go for brass😊
mine have springs on them that is supposed to hold them tight, the valve is tapered and the spring keeps the tapered valve in the body. They get kind of gunked up with dirt and stuff and start to leak a little. i found you can dissassemble them and clean them up good, then stretch the spring a little bit to put more tension on it, and they work good again till the next time they get gunked up.
a lot of the air tanks use on trucks had the same style of valves for draining water. i can get them cheap at napa and they come in 1/4. 3/8 and 1/2 inch npt thread.
I hadn't thought about refurbishing them. I'll pull them off friday and try it! Thanks!