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 575 mm module covering the SLR2048 and SLR2548 positions. Matching lamps are stocked under items 1307-0304 (SLR2048V), 13170-0812 (SLR 2048 VH) and 1389-0308 (SLF2848 / SLR2548). Wedeco was founded in Herford, Germany in 1976 and is now a Xylem brand.