Senco Framing Nailer SN4 and SN70 Parts BB0065 and BB0059 William Hendricks Posted on Posted in Senco Parts, Senco SN4 + SN70 BB0065 + BB0059 Bumper Keeper + BumperBumper Keeper and Top Piston Bumper Sold as a set for the Senco SN4 and SN70 nailers Ships free in the USAvailable Qty: 1