HP CF237A (HP 37A) Black Toner Cartridge is designed to perform in the HP LaserJet Enterprise Flow MFP M631h, Flow MFP M632z, Flow MFP M633z; M607dn, M607n M608dn, M608n, M608x, M609dh, M609dn, M609x; MFP M631dn, M631z, M632fht, M632h, M633fh