Fel-Pro 35710 Rubber O-Ring Thermostat Gasket

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Rubber o-ring thermostat gasket, used instead of dual paper gaskets.  Requires a bit more care to get centered between housings and will leak if overtightened.   Groove in center of ring slips over edge of thermostat.  Photos show fit to housings.  Photo with ring half on is to enable visual of split o-ring  For experienced mechanics only.  Re-usable.

Lifetime warranty