The Franklin Machine Products 141-2028 Replacement Diaphragm is a crucial component designed for the RESS-C-1.6, RESS-C-3.5, and RESS-C-4.5 Sloan® Optima Plus™ flush valves, providing optimal performance and reliability. This replacement diaphragm is essential for maintaining the efficient operation of these specific flush valves, ensuring consistent water flow and reducing the need for frequent maintenance. The inclusion of a white regulator specifically calibrated for 3.5/4.5 GPF (gallons per flush) enhances its functionality, making it a versatile choice for various settings that require precision in water usage such as commercial restrooms, public facilities, and high-traffic environments. The diaphragm's compatibility with multiple models of the Sloan® Optima Plus™ range highlights its adaptability and utility across different operational contexts within the plumbing industry. Its design focuses on durability and efficiency, key for plumbing professionals seeking reliable replacement parts that uphold the performance standards of the original equipment. The Franklin Machine Products 141-2028 Replacement Diaphragm thus serves as a robust and dependable solution for facility managers and maintenance teams looking to optimize their water systems with parts that are specifically engineered for compatibility and efficiency.