Manufactured with OEM quality materials and safety standards by an OE Supplier. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable Product Features:Larger opening for increased coolant flowIncreased strength and durabilityHigh grade stainless steel and copper constructionMeets or exceeds OEM standardsConsistent and precise response to cooling system needs100% tested and calibrated