HP Printhead
C9421A
is compatible in the following HP Models:
HP DesignJet 30 Printer series
HP DESIGNJET 30 PRINTER - C7790D
HP DESIGNJET 30N PRINTER - C7790E
HP DesignJet 130 Printer series
HP DESIGNJET 130 PRINTER - C7791C
HP DESIGNJET 130NR PRINTER - C7791D