This sensor is used in the bottle filler portion of the first generation EZH2O bottle filling station, including EZS8WSLK, LZS8WSLK, EZO8WSSK, LZO8WSSK, EZSTL8WSLK, LZSTL8WSLK, EZOTL8WSLK, LZOTL8WSLK, EZOOTL8WSLK, LZOOTL8WSLK, EMABF8WSLK, LMABF8WSLK, EMABFTL8WSLK, LMABFTL8WSLK. Also Fit For bottle filling station, including HTHB-HAC8PV-NF, HTHB-HAC8PV-WF, HTHB-HAC8BLPV-NF, HTHB-HAC8BLRPV-NF, HTHB-HAC8BLPV-WF.