Abstact： ASME A112.18.1:20121 pdf download.Plumbing supply fittings. 4.4.3.2 Fittings with non-standard threads for aerators or other end point devices may be used. 4.4.4 Hand-held shower connection threads shall be 1/2-14 NPSM or lSO 228-G 1/2 B (s
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