O-ring and lower bumper rebuild repair kit for the Duo-fast KB-1836 nailer. Du-Fast KB-1836 O-ring Kit Plus Bumper BN-110-4Aftermarket O-ring Kit Aftermarket lower Bumper BN-110-4Available Qty: 5Price: $18.95Quantity: Post navigation Duo-fast DS-120-3 Exhaust Valve Duo-Fast TI-3118 Parts for Upholstery Stapler