CFR›Title 10›Chapter II›Part 431›Subpart O ContainsSections 431.261–431.263; Subject groups Energy Conservation Standards–Test ProceduresCorpusDaily eCFRDisplayed edition2026-05-07Last updated2026-05-07 Subpart O—Commercial Prerinse Spray Valves Contents 431.261 § 431.261 Purpose and scope. 431.262 § 431.262 Definitions. 431.263 § 431.263 Materials incorporated by reference. Energy Conservation Standards Energy Conservation Standards Section 431.266 Test Procedures Test Procedures Section 431.264 Source70 FR 60418, Oct. 18, 2005, unless otherwise noted. Previous N Subpart N—Unit Heaters Next P Subpart P—Mercury Vapor Lamp Ballasts