Fel-Pro® gaskets are specifically designed for the repair environment to deliver a reliable seal on even the most troublesome applications. Designed for imperfect sealing surfaces and manufactured with proprietary materials, you can count on Fel-Pro for innovative sealing solutions for the real-world repair environment.FEL-PRO 35720 Engine Coolant Thermostat Housing Seal for Chevrolet Silverado 1500Each Fel-Pro gasket, no matter how small, is engineered to exacting standards with proprietary design, engineering and manufacturing processesEngineered and manufactured specifically for the repair environmentMeets or exceeds all original equipment specificationsApplication specific design to ensure a perfect fitUnsurpassed quality you can trust