When I was looking at options I started with replace the spring (in theory replacing one small part should be less wasteful than replacing the whole assembly, what can I say - I have a cheap streak in me). I also looked at complete new drain cocks.
They seem to be given part number DC601-8 by Parker Hannefin. Fastenal lists something similar as their part # 699963 and a functionally similar part can be found as 42-104 at apollovalves.com
If you end up with more drain cocks than you really want, I could be interested.
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