This is the official Busch O-Ring made of Viton material, sized 61.9 mm x 3.53 mm (Part #320274). Viton (FKM) is a high-performance rubber compound known for excellent resistance to high temperatures, chemicals, oils, and solvents . This O-ring provides a reliable and secure seal in various applications, ensuring a tight seal to prevent leaks and maintain the efficiency of your pump system
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