Wiper ring for the quartz sleeves of older-generation Berson ultraviolet disinfection systems. It is the wearing part of the sleeve-cleaning mechanism: it wipes away scale, mineral deposits and other fouling so UV output reaches the water rather than being absorbed by the sleeve. Because it is stocked specifically for superseded Berson models, it is the part to quote when the original is no longer listed. Confirm the system model before ordering. Reference number 10124-0309.