This Guardian Equipment AP400-015 is a 3/4" female inlet adapter that allows one to connect a standard 3/4" garden hose to the inlet of faucet-mounted eyewashes such as the G1100, G1101, G1200, and G1201. The overall height is 0.675 inches and overall diameter is 1.175 inches. For reference, the outer diameter of a standard 3/4" garden hose male threaded (MHT) end is 1-1/16" with 11.5 threads per inch (TPI). Some faucets, particularly those in utility sinks, also have this threading.
This item is supplied complete with a rubber washer for the 3/4" garden hose connection (or faucets with garden hose MHT ends). This item will not fit on the outlet side of the eyewashes and is not meant to be a faucet adapter. Replacement outlet aerators for these units are available as item # 450-005.