This is a Vent Valve O-ring designed to replace Pentair R172221 O-Ring for High Capacity Automatic Feeder Dynamic Series Chlorine/Bromine Dispensers, Dynamic Series 1 Inline Cartridge Filter and Dynamic Series II and III.
This o-ring is also identical to these parts: Blue White 9003009, Doughboy 3081152, Hayward/Arneso F24, Hayward ECX961124, Leisure Bay 111733, 303416, Lomart/Prestige Metal 53019, 53049, Pentair/Letro F24, Pentair/Rainbow R172221, R172224, Sta-Rite/Swimquip 255750114, and 355050114.
This o-ring has been manufactured in accordance with OEM specifications and is designed to meet or exceed the original manufacturer specifications.