Epson 5000 - Manual (Page 103)

2. Hold the single-bin cut-sheet feeder in both hands. Fit the
notches in the single-bin cut-sheet feeder over the
mounting posts on the rear of the high-capacity cut-sheet
feeder.
3. Pull the single-bin cut-sheet feeder toward the high-capacity
cut-sheet feeder. While pushing firmly on the tab locks,
press the two cut-sheet feeders together until they are
securely locked together.
Using Printer Options 4-11