This UV lamp is a direct replacement for the Berson B42VI UV system. The lamp delivers an output that ensures effective disinfection by deactivating bacteria and viruses in water. It has a diameter of 15 mm, a total length of 843 mm, and a service life of 9000 hours, ensuring long-lasting, stable operation. Key benefits: Direct replacement for Berson B42VI; 4-pin base for safe and easy installation; long service life of 9000 hours; optimal UV output for effective water treatment. Please contact us if you are unsure whether this UV lamp fits your system.