Tridon Thermostat Gasket TTG34 Tridon's thermostat gasket are manufactured to stringent standards and are designed to replace the original gasket. A thermostat gasket performs a simple job in providing a seal between thermostat housing and/or the engine block. Tridon offer two styles of thermostat gasket: paper, and rubber o-ring style depending on application. Tridon's thermostat gaskets last the distance, fit and are water tight. Notes: Rubber seal gasket.