Laserjet 4200/4300 Series Duplexer New In Box - $100 (E. Toledo)
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HP part number Q2439B. This is a brand new genuine HP duplexer, still in its original box.
This duplexer fits the Laserjet 4200 4250 4300 4350 Series of printers. I have one of these at the moment, as well as some pickup and transfer rollers for these machines.
I have many other parts and cartridges for other Laserjet printers, give me a call with a list of your needs. Thanks for reading the post!