ASME A112.18.1-2012 pdf – 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 ISO 228-G 1/2 B (see ISO 228-1). 4.4.5...
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