For Sale is a Genuine McCulloch New Old Stock kit to convert your saw from the molded fuel line to standard off the shelf fuel line.  

Bushing goes into the fuel tank (you will need to use some sealer on this to keep it from leaking)  

This fits Walbro Carburetors:
McCulloch Pro Mac 700 or 4300
McCulloch Pro Mac 10-10, 10-10S, 55, 555, 7-10, 7-10A

McCulloch Pro Mac 850, 570

McCulloch Super Pro 80, 81, 81E, 60, 70