(a) Special purpose fittings made in accordance with the applicable standards listed in table 2 to § 56.60-1 of this part and of materials complying with subpart 56.60, may be used within the material, size, pressure, and temperature limitations of those standards and within any further limitations specified in this subchapter.

(b) Nonstandard special purpose fittings must meet the requirements of §§ 56.30-25, 56.30-40, 56.35-10, or 56.35-15, as applicable.