This quartz sleeve (original part number 2.55.029) is compatible with earlier Berson Inline UV systems, including the B2000 and B2500 models. With a length of 1147 mm and an outer diameter of 33 mm it protects the UV lamp from contact with water and contamination while providing high UV transmission for effective disinfection. The sleeve is open at both ends and produced in durable quartz glass rated for continuous UV exposure. Maintenance guidance: the sleeve should be cleaned annually and replaced every three to five years for optimal performance. Please get in touch if you are unsure whether this sleeve fits your UV system. Compatible with B2000. Product group: UV Quartz Sleeves. Sales unit: pcs.