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 1094 mm module covering the A15 and SLR25100. The matching lamp is stocked under item 1341-0107 and the A15 ballast under item 13381-0421. Wedeco was founded in Herford, Germany in 1976 and is now a Xylem brand.