Replacement valve for the Zodiac Polaris 180, 380, 280, 480 PRO, 3900 Sport, Vac-Sweep 380, Vac-Sweep 280, 280TankTrax, Pentair E10 models. New update level: regarding; After the previous replacement valve, the shell material was changed. improved and manufactured Made from a blend of anti-crack polymers that is more resistant to wear. wear-resistant and less susceptible to damage than the previous product and has a service life twice as long. Gear mechanism G53: manufactured; Made of friction-resistant and sturdy POM material. Pom has an extremely low coefficient of friction and good stability. geometric, which is particularly suitable for the production of gears and bearings. This material is more wear-resistant. High speed operation, high water pressure. FunctionThe updated version solves the problem when your pool cleaner gets stuck. Over an obstacle and even though your emergency valve is still open, the nozzle no longer sprays water and at the same time holds the water back. outside.