The quartz module is the sleeve assembly supplied as a complete unit rather than as a bare tube — sleeve, seals and end fittings together, ready to fit. This is the 800 mm module for the Multiray MLR25630. The quartz sleeve separates the ultraviolet lamp from the water while passing UV-C into it. Length, diameter and wall thickness all 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. Wedeco was founded in Herford, Germany in 1976 and is now a Xylem brand.