This part fits Chicago Pneumatic CP7120 Heavy Duty Air Needle Scaler. Key # 20 on the parts diagram.
Chicago Pneumatic Socket Retainer & O-Ring For 1" ANVIL Models CP797 & CP797-6
Chicago Pneumatic A047095 Retainer-Quick Chang
Chicago Pneumatic RETAINER
Chicago Pneumatic 7110K Heavy Duty Air Hammer Kit with 4 Chisels and Retainer
CP Chicago Pneumatic 2420 SR25UF4 Air Driver Drill 1/4" Hex Collet w/ ReverseP2
Chicago Pneumatic 789R-26 3/8" Reversible Air Drill Driver