Beautiful, beautiful parts. These petcocks were fitted to only ONE year of Meriden twin (1980), and they were the best they ever used. One MAIN petcock, one RESERVE. Installed, they look and work fantastic, with very smooth action and NO leaking. (Jam nuts, tank sealing washers and bottom ferrules not included, but your EXISTING PARTS will fit right on....)
1/4" BPT thread, which will fit very late BSA ('71-on), all Norton Commando and Triumph back to the early '50s.