Features: 【Function】 Direct replacement for the original O-rings. Regularly check the condition of the O-ring and replace it if damaged to ensure proper operation of your pool/spa system. Replaces for R172240 / R172223. 【Alternate Part Numbers】 Fits for the following part numbers: CX120D, WW8050360, 392003, O-330, Baker Hydro 17B1087, Hayward/Arneson W542, Hayward AXW542, CX120D, Jacuzzi 47036009R, Jandy R0558800, Leisure Bay 001135, Lomart/Prest Metal 53200, American 39200300, Rainbow R172223, R172240, Starite/Swimquip 1692012, Waterway 8050360 .