Quartz sleeve holder 6 cm for Katadyn ultraviolet disinfection units, supplied with the sealing O-rings included. The holder locates and retains the quartz sleeve at the correct depth in the reactor and provides the sealing seat against the housing. Having the seals in the kit avoids a second parts order when a sleeve is changed. Reference number 1188-0608. Katadyn part reference 11127-1403.