70-4778 is the OEM number

but we narrowed up the profile for the right look

These caps also work with stock ('36 - '82) and aftermarket gas tanks with the bayonet style bung (which is up to 1982)

This is a reprint of the original factory spare parts manual for 1936 to 1948 Harley-Davidson twin models including Knucklehead

Sportsters in this year range are Ironhead Sportsters

22MM Power-Flo Petcock - Hex Body - Chrome - Forward Subcategory_Cable Clamps 70-4778 is the OEM numberPingel Power Flo Fuel Valves offer Substantially Higher Fuel low than any petcock made for motorcycles! Substantially higher fuel flow compared to OEM or aftermarket fuel valve Necessary for adequate fuel delivery even on stock motorcycles and a must for high performance All descriptions are made from a seated position on the motorcycle with a reference from outlet position to the on, reserve and off position of the fuel valve lever. See diagram in