Pennant, Tube Assembly, Cupronickel Tubes, 1750, Code Compliant ASME Heat Exchangers, Built in accordance w/the requirements of the ASME Boiler and Pressure Vessel Code, Individually serialized w/H-4 data reports on file as required by section HG-520.2 and HG-53l, Cupronickel tubes and glass lined headers, ideal for some corrosive or soft water applications (under 7.5 grains) or when hard water pumping creates higher velocities. Glass lined headers. Note: Bronze headers also available. Contact Customer Service for pricing and availability.