This is the first edition of ASSE 1037/ASME A112.1037/CSA B125.37, Performance requirements for pressurized flushing devices for plumbing fixtures. It supersedes the previous edition of ASSE 1037, published in 1990, and it replaces the requirements for flushometer valves in CSA B125.3, published in 2012.This Standard covers pressurized flushing devices (PFDs) intended to flush water closets, urinals, and other plumbing fixtures and specifies requirements for materials, design, methods of operation, test methods, and markings. In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the standard.