Senco LB3499 seal + BC0178 top bumperFor the Senco SN325 nailer 1 LB3499 washer firing valve seal 1 BC0178 top piston bumper Available Qty: 14 Post navigation Senco Model K O-ring rebuild kit + LB5012 washer firing valve seal Paslode 3250 O-ring kit + Bumper + Gasket + Cylinder Seal