HP Envelope Feeder
C2082-67901
is compatible in the following HP Models:
HP LaserJet 4 Printer series
HP LASERJET 4 PLUS PRINTER - C2037A
HP LASERJET 4 PRINTER - C2001A
HP LASERJET 4M PLUS PRINTER - C2039A
HP LASERJET 4M PRINTER - C2021A