Webasto Blower Casting O-Ring
Webasto blower casing O-Ring. Replace if o-ring is split or when you are replacing bearings, housings, motor, wiring harness. This seal looks to be not required.. But a broken oring, or improperly installed o-ring or Cracked housing allows the bypassing of inlet combustion air from the intake shutter. This will cause premature failure to the burner head, air swirler, or combustion chamber.