Retaining ring for the wiper ball bearing on Trojan SCD series ultraviolet disinfection systems, part 013252-0112302. The ring locates the bearing in the wiper drive housing; it is a small component but the one that stops the bearing walking out of position under the reversing load of an automatic wiper. Replaced whenever the bearing is changed, since it is disturbed to get the bearing out and is not reliably reusable once sprung. Reference number 15178-0118.