WATTS 1 inch for use with Boiler Trim Out Package. Packages containing HP-BHM Boiler Header Module, ETX-30 Expansion tank, and B911S-M3 Fill Valve Assembly. Faster cleaner installations. Complies with boiler manufacturers' piping requirements. Includes HP-BHM Boiler Header Module, ETX-30 Expansion tank, and B911S-M3 Fill Valve Assembly. Key boiler piping products packaged in a single carton