Fitting adapters adapt to standard female pipe threads from a fitting socket. Solder connections. Wrot copper solder joint pressure fittings are produced to 1 of the following specifications: material and workmanship ASME/ANSI B16.22; dimensional, material, and workmanship of MSS SP-104 or MSS SP-109; certified to NSF/ANSI 61. Dezincification resistant. Third party certified to Annex G of NSF/ANSI 61 (180°F commercial hot). Complies with Section 116875 of the California Health and Safety Code and Vermont Act 193. Lead free refers to the wetted surface of pipe, fittings and fixtures in potable water systems that have a weighted average lead content =0.25%; source: California Health and Safety Code (116875); Vermont Act 193