This product offers better fuel flow and retains the stock crossover connection of your 1935-1965 Harley-Davidson Big Twin split fuel tanks. Don’t let the stock fuel valve be the bike’s main jet. The stock fuel valve set up simply cannot support today’s high performance engine fuel demands. This stainless steel gas tank adapter and any of the 22mm threaded Pingel Power-Flo or Guzzler fuel valves will drastically improve your fuel supply.