Oblò Viessmann 7811837

Viessmann sight glass (art. 7811837) is an original spare part for Viessmann Vitocrossal CT3 boilers with power 80–285 kW. Designed for installation on the boiler body, providing visual control of the combustion chamber condition. Made of heat-resistant glass with sealing rings, ensuring reliable tightness and operational safety. Easy to install and replace, suitable for professional maintenance and repair of Viessmann boilers.