Section 84.71 - Self-contained breathing apparatus; required components(a) Each self-contained breathing apparatus described in § 84.70 shall, where its design requires, contain the following component parts: (1) Facepiece or mouthpiece, and noseclip;(2) Respirable breathing gas container;(3) Supply of respirable breathing gas;(4) Gas pressure or liquid level gages;(6) Remaining service life indicator or warning device;(7) Hand-operated valves;(9) Safety relief valve or safety relief system; and(b) The components of each self-contained breathing apparatus shall meet the minimum construction requirements set forth in subpart G of this part.