This O-ring, measuring 10 x 4 mm, is made specifically for the quartz clamp in Berson UV systems. It ensures a tight and watertight seal of the quartz glass components and prevents leakage and ingress of moisture into the UV chamber. The O-ring is produced from durable material that tolerates pressure and temperature variation over time. Key benefits: Fitted to the quartz clamp in Berson UV systems. Dimensions: 10 mm diameter, 4 mm thickness. Provides reliable and long-lasting watertight sealing. Easy to install and replace. Please get in touch if you are unsure whether this O-ring fits your system.