Of all the components that make up this Fuel 2 the O-ring (655) has the lowest price.
A sample from the products for the Fuel 2 include: Hose (l2050), Hose (l850), Primer Pump Assy, O-ring (655).
This part-list fiche shows all the components that make up the 40mhz/trz 2001 Fuel 2 .