The Epson Ink Pad Eject, Right FI (1511241) is a porous pad listed in the Epson L1800 parts inventory. It serves the printer’s ink-ejection system and is identified for the right side.
The FI designation identifies this particular variant among the right-side pads in the parts list. It is listed separately from the FF, FG and FH versions, so the code helps distinguish the intended part when identifying a component for repair.
The parts inventory gives it reference 715. This description covers the pad identified by that part number and variant code.