The quartz sleeve separates the ultraviolet lamp from the water while passing UV-C into it. Length and diameter both identify a sleeve, and this catalogue stocks several at similar lengths — order against the reactor model rather than against a measurement of the old part alone. This 330 mm sleeve covers the KM100, KM200 and KM400. Note that this catalogue lists a separate sleeve for the larger KM 900 to KM 1500 under item 1322-0106. Wedeco was founded in Herford, Germany in 1976 and is now a Xylem brand.