A complete set for one petcock, as shown. Suitable for 1/4" BPT thread, which will fit very late BSA ('71-on), and nearly all Norton Commando and Triumph back to the early '50s.
Included are:
70-7351 Stat-o-seal washer
83-0002 Flat washer
83-0006 1/4" BPT thin nut