This quartz sleeve (original part numbers 8.55.013 / 24QDV009) is designed for use in Berson Inline+ systems and has a length of 540 mm. The sleeve is made from F240 quartz glass, which blocks UV radiation below 240 nm and thereby limits unwanted short-wavelength output. It encloses the UV lamp, protects it from direct contact with water, and transmits effective UV radiation for disinfection. Maintenance guidance: the sleeve should be cleaned annually and replaced every three to five years for best UV performance. Please get in touch if you are unsure whether this sleeve fits your UV system. Compatible with F240. Product group: UV Quartz Sleeves. Sales unit: pcs.