Hayward AIR TUBE-C4000

the Hayward Air Relief Tube for the C4000 series is an essential internal venting component specifically designed for the SwimClear multi-element cartridge filter systems. Measuring approximately 28 3/8 inches in length, this tube is fabricated from a specialized, chemical-resistant polymer that maintains its structural rigidity while submerged in treated pool water. Its primary mechanical function is to provide a dedicated channel for trapped air to escape from the top of the filter tank to the manifold or manual relief valve, effectively preventing the formation of air pockets that can cause pump surging or reduced filtration surface area. By ensuring the tank remains fully flooded, the tube optimizes hydraulic efficiency and protects the internal cartridge elements from uneven pressure distribution during the filtration cycle. For shipping and logistical purposes, the estimated weight of the Hayward C4000 Air Relief Tube is approximately 3.2 pounds in its retail protective packaging, while the actual dry weight of the tube assembly itself is roughly 1.2 pounds.