PACKAGE CONTENTS: This set includes 8 pieces of the B-108288 valve replacement parts, ensuring you have enough for your 503, , and 504 series flush valves. Each part is designed to fit perfectly, mirroring the original specifications for seamless compatibility. HIGH-QUALITY MATERIAL: Constructed from premium, highly elastic rubber, these valves are designed to withstand wear and . Their durability makes them ideal for prolonged use in water, ensuring reliable operation of your flush tank over time. FUNCTIONAL DESIGN: Engineered as a one-way check valve, this component is crucial for maintaining optimal flushing performance. It facilitates air induction into the flush tank, which is essential for ensuring proper air circulation and maintaining stable pressure levels for effective flushing. EASY INSTALLATION: Designed for hassle-free installation, these replacement valves can be installed quickly without the need for any tools. This simple, time-saving process helps restore the functionality of your flush valve promptly, minimizing downtime.