Replacement Seal for McFarlane Piston Knob Assembly

If the quad rings (P/N 7750) on your McFarlane Piston Knob Assembly show wear, replace with these new McFarlane seals.

Note: When servicing the McFarlane Fuel Primer, if the primer tube shows wear, replace with a new McFarlane Fuel Primer assembly. If the knob assembly or plunger shows wear, replace with McFarlane knob assembly P/N 7711 (coming soon!). If the plunger seal surface in the valve shows wear or is no longer sealing, replace the entire Fuel Primer unit. See ICA 7748 for details.