The Guardian AP400-012 is a female inlet adapter for faucet-mounted eyewashes such as the G1100, G1101, G1200, and G1201. The threading is 13/16"-24 female on the faucet side and 55/64"-27 male on the eyewash side. The other female inlet adapter available is the AP400-015 which allows one to connect these eyewashes to a standard 3/4" garden hose.
The G1100 and G1200 series are furnished with three male inlet adaptors (15/16"-27, 13/16"-27 and 3/8" IPS) for installing on most commonly used faucets, including laboratory-type faucets. A replacement set of these adapters is available as item # AP400-009.