1.1 This specification2 covers seamless red brass (Copper Alloy UNS No. C23000)3 pipe in all nominal pipe sizes, both regular and extra-strong. In the annealed temper (O61), the pipe is suitable for use in plumbing, boiler feed lines, and for similar purposes. In the drawn general purpose temper (H58), the pipe is suitable for architectural applications, such as guard railings and stair hand railings. 1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information purposes only. 1.3 The following hazard caveat pertains only to the test method portion, Section 9, of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.4 Warning—Mercury is a definite health hazard in use and disposal. (See 9.1.)