These printers use the C9371A cartridge:
HP DesignJet T-610 (24-44 IN)
HP DesignJet T-620
HP DesignJet T-620 Wideformat
HP DesignJet T-770
HP DesignJet T-770 Wideformat
HP DesignJet T-790
HP DesignJet T-790 EPrinter
HP DesignJet T-790 POSTSCRIPT EPrinter
HP DesignJet T-795 EPrinter 44IN
HP DesignJet T-1100 (24-44 IN)
HP DesignJet T-1100 PS (24-44 IN)
HP DesignJet T-1120
HP DesignJet T-1120 HD
HP DesignJet T-1120 HD Wideformat
HP DesignJet T-1120 PS (24-44 IN)
HP DesignJet T-1120 SD
HP DesignJet T-1120 SD MFP
HP DesignJet T-1200
HP DesignJet T-1200 HD 44 IN
HP DesignJet T-1200 Wideformat
HP DesignJet T-1300
HP DesignJet T-1300 EPrinter
HP DesignJet T-1300 POSTSCRIPT EPrinter 44IN
HP DesignJet T-2300
HP DesignJet T-2300 EMFR
HP DesignJet T-2300 POSTSCRIPT EMFR
HP DesignJet SD PRO