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. Ordering the module rather than the loose sleeve removes the two things that most often go wrong at a sleeve change: a seal reused past its compression set, and a sleeve loaded unevenly at assembly. This is the 1830 mm module covering the VLR30 and WLR30. The matching WLR30 lamp is stocked under item 1382-0108. Wedeco was founded in Herford, Germany in 1976 and is now a Xylem brand.