Part number 4931379022 is a genuine replacement Fixtec Quick-Change Outer Chuck Sleeve, used extensively across Milwaukee heavy-duty rotary/combi hammers, including:
PLH & PH Series: PLH 32, PLH 32XE, PLH 30, PLH 30XE, PH 26X.
PPH & PFH Series: PPH 24X2E, PPH 26XE, PPH 30X2E, PFH 24QEX, PFH 25QEX.