This Diaphragm, Sol (HORTON Valve) is a genuine Bunn OEM replacement part. Part number 39975.0004 is used for certain commercial coffee equipment made by BUNN. This part will help repair specific issues you are having with Bunnomatic model AX, AXAPS, AXTWIN, CDBCF, LCA. Replace this part if BUNN or a service technician has instructed you to do so. Over time Solenoids for Bunn AX, AXAPS, AXTWIN, CDBCF, LCA may need to be replaced because of normal wear and tear or if damage has occurred to the existing part. When replacing BUNN part #39975.0004 it is suggested that no power or water is connected to the machine and you are working in clean and non hazardous environment. Please be sure Diaphragm, Sol (HORTON Valve) fits your specific needs.