This O-ring measuring 15 x 3 mm is made for use together with the 1/2" plug in the end flange on Berson UV systems. It provides a sealed and reliable closure that protects the system from leaks, moisture, and dirt. Made from a robust material that withstands continuous exposure to water and temperature fluctuations. Key benefits: Fits the 1/2" plug end flange in Berson UV systems. Dimensions: 15 mm diameter, 3 mm thickness. Provides a safe and watertight seal. Easy to install and maintain. Please contact us if you are unsure whether this O-ring suits your system.