O-ring rebuild kit for the Senco SN1 finish nailer, includes seal LB5004.
Ships with an O-ring reference sheet and schematic.
Senco SN1 Feeder Spring kit YK0020 on ebay (Not Mine)
SN1 Feeder Spring YK0020
Includes parts
Feeder Spring KB5191
End Piece GB0146
End Piece GB0147
2 Pins Pre ’84 and Post ’84
Instructions