Quartz sleeve for Hanovia medium-pressure ultraviolet disinfection systems, part 320004, 1488 mm long. 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. Take care with the length on this group: this catalogue carries more than one 1488 mm Hanovia sleeve under different part numbers, and length alone does not identify the sleeve — 320004 and 320001-1488 are separate parts that happen to share a length. Order against the part number. Reference number 22105-1113.