This end flange (original part no. 2.12.622*2.01) is designed for the Berson Inline 300 UV system and also fits models such as the GSW1 and Proline. The flange provides a sealed, secure closure of the UV chamber and holds the quartz sleeve and lamp firmly in place. For proper sealing we recommend using an O-ring 208x4 mm (Aqua & Care item no. 1089), which must be ordered separately. Key benefits: Fits the Berson Inline 300, GSW1 and Proline. Provides a sealed, robust closure of the UV chamber. Original part no.: 2.12.622*2.01. Uses O-ring 208x4 mm (item no. 1089). Ideal for replacement or maintenance. Please get in touch if you are unsure whether this end flange fits your UV system.