This O-ring measuring 20 x 3.5 mm is used as a seal in several components in Berson UV installations. It ensures a watertight connection and protects against leaks and moisture. Made from durable material for long service life and stable performance in demanding environments. Key benefits: Dimensions: 20 mm diameter, 3.5 mm thickness. Ensures tight and secure sealing. Compatible with several parts in Berson UV installations. Easy to replace during maintenance. Please get in touch if you are unsure whether this O-ring fits your UV installation.