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Any sppplier can say what he wants, but if you do not use a high-temp resistance O-ring at this spot, you can expect a leakage in no-time.
Therfor we recommend to order these O ring with you gasketset.
These O rings are VITON rubber. VITON can handle a higher temperature than NBR, which can stand around 100 degrees C. VITON can handle around the double.