The Fill Valve 1.28gpf for G0028990/G002899097 Maxwell HET Tanks by Gerber Plumbing Fixtures is engineered for high-efficiency toilets. This fill valve ensures optimal water flow and refill rates, maintaining the performance of your toilet system. Designed for easy installation, it is compatible with Maxwell high-efficiency tanks, providing a reliable solution for your plumbing needs. The valve is constructed from durable materials, ensuring longevity and resistance to wear. Upgrade your toilet with this efficient fill valve for improved performance.