Quartz sleeve for Hanovia medium-pressure ultraviolet disinfection systems, catalogued under reference UVHATU0022 and supplied for units badged Veolia as well as Hanovia. The quartz sleeve is the pressure barrier between the treated water and the lamp, and the only optical path between them, so it must both hold system pressure and pass UV without loss. This sleeve is supplied with its seals included, which is worth knowing before ordering: sleeve seals are single-use and on most sleeve listings they have to be ordered separately, so no additional seal kit is needed here. Reference number 22138-0917.