B5107-RKS300 Dixon Valve Red Silicone Sanitary Repair Kit for Butterfly Valves - 3" Valve Size (Old Part #: B5101-RKS300)Features: A new rubber compound for both EPDM and silicone with improved self lubricating properties Reduced torque minimizing the potential for stem twist in high cycle and viscous tacky process applications Increased seal life, especially in high cycle applications; a longer life = reduced maintenance costs Improved sealing and operational characteristics for low temperature 36F to 45F (2C to 7C) applications Interchangeability with B5101 seats