22mm x 28mm Tundish Compatible with: Santon Tribune Premier Cylinders Plastic tundishes are most commonly installed within heating and cooling systems to act as a safety device for both pressure and temperature relief valves. Water flowing through a tundish is an indication of a fault with the system and alerts the occupants of the building to the fault. Our tundish range also acts as a backflow prevention valve. Its primary purpose is to prevent cross-contamination between a water systems overflow or discharge pipe and a sewer line or drain. Incorporates a slimline design, type AA backflow prevention and a variety of angles & sizes available.