Features: The 273564Z manual air relief valves efficiently releases trapped air in pool/spa filters, ensuring optimal performances and compatibility with TR100C systems. Features a manual operation design with integrated pressure gauge for real time monitoring, constructed from plastic for long lasting reliability in sand filtration systems. Ideal for pool maintenance professionals and homeowners seeking to enhances filtration efficiency in residential or commercial systems. Designed for sand filter systems in swimming pools and spas to maintain proper water pressure and claritys during routine maintenance cycles. Simplifies air release processes with its ergonomic handle and clear status window, enabling quick 5 second operation while reducing noise levels to 60dB during filter cycles. Specifications: Material: Plastic Color: as shown in the picture Applicable Models: Suitable for TR100C Size: As Picture Shows Package Includes: 1 Set Manual Air Relief Valves note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color from the item.