Please check the where you saw “A112.181M.” Look for:
You type it into a search bar, expecting a direct link to a replacement part, only to find yourself in a rabbit hole of forum posts and mixed results. If this is you, don't worry—you haven't found a model number; you've found a "secret" code that is much more common than you think. It’s Not a Model Number—It’s a Standard a112.181m
Occasionally, standards are proposed (draft numbers) and later withdrawn. A112.181M does not appear in current ASTM, ISO, DIN, or SAE databases. The “M” suggests metric, but the ".181" sub-number is unusual for ASTM. Please check the where you saw “A112
This standard dictates the performance, testing, and design requirements for "Plumbing Supply Fittings," which include: (Kitchen, sink, and lavatory) Showerheads and hand-held showers Aerators and terminal fittings Supply stops and valves Why This Code Matters to You " which include: (Kitchen