(Note that the 'on' of the standard petcock was stamped upside down, that's just the way they are for now. Plastic filters might be a little deformed also, does not affect performance.)
As fitted to one year of Meriden Triumph (1980?), but the among the best they ever used. Very nice action, matched set, reserve on one side. Includes nuts (plated, not brass) and sealing washers shown.
Threaded on the bottom to accept stock '60s/'70s fuel lines. 1/4" BPT thread, which will fit very late BSA ('71-on), and nearly all Norton Commando and Triumph back to the early '50s.
I will answer questions promptly, good luck and thanks for looking.