Washer, Back-Up, Aluminum, Compatible with Grainger Part Number 6CCN6, 6CCN7, 6CCP6, 6CCP8, 6CCR1, 6CCR2, Compatible with Manufacturer Model Number PD20A-AAP-AAA-B, PD20A-AAP-GGG-B, PD20A-AAP-GGG-G, PD20A-AAP-STT-B, PD20A-ACP-AAA-B, PD20A-ACS-HAA,...