This one definitely does have the screen, I will check.Typically Land Rover steering reservoirs have a screen in the reservoir that will cause cavitation in the pump due to inadequate flow. For example, my brother in law's DII steering pump came apart (only catastrophic failure I've seen) and when I put the new pump I couldn't get it to bleed. Turns out the screen was clogged with metal from the pump. Whenever I do a steering repair I always flush the system before repairing and then replace the reservoir.
FWIW, the catastrophic failure of the pump I had in the white D1 somehow allowed the metal pieces to go through that screen (which likely destroyed the junkyard LR pump I found in St.George in about 500 miles).