Seller notes

Replacement thermostat O-ring for use on your 1994-2003 7.3L Powerstroke engine - with an aftermarket reinforced thermostat housing. Do you have an aftermarket billet thermostat housing on your 7.3L Powerstroke and it’s still leaking coolant? That is most likely due to the inferior stock O-ring that most vendors supply with their kits. The stock O-ring is a square cut design and applying more clamping pressure to it by using a reinforced thermostat housing will often cause the O-ring to roll o...

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