These printers use the C9449A cartridge:

HP DesignJet T-1200
HP DesignJet Z-2100
HP DesignJet Z-2100-24 IN
HP DesignJet Z-2100-24 Inch
HP DesignJet Z-2100-44 IN
HP DesignJet Z-2100-44 Inch
HP DesignJet Z-3100
HP DesignJet Z-3100-24 IN
HP DesignJet Z-3100-24 Inch
HP DesignJet Z-3100-44 IN
HP DesignJet Z-3100-44 Inch
HP DesignJet Z-3100 PS 24 IN
HP DesignJet Z-3100 PS 24 Inch
HP DesignJet Z-3100 PS 44 IN
HP DesignJet Z-3100 PS 44 Inch
HP DesignJet Z-3200-24 IN
HP DesignJet Z-3200-24-Inch Wideformat
HP DesignJet Z-3200-44 IN
HP DesignJet Z-3200-44-Inch Wideformat
HP DesignJet Z-3200 PS 24 IN
HP DesignJet Z-3200 PS 24-Inch Wideformat
HP DesignJet Z-3200 PS 44 IN
HP DesignJet Z-3200 PS 44-Inch Wideformat
HP DesignJet Z-5200
HP DesignJet Z-5200 PS
HP DesignJet Z-5400 POSTSCRIPT EPrinter
HP DesignJet HD PRO