2 EXCHANGES REQUIRED, (NOT AVAILABLE WITHOUT EXCHANGE) COMPLETE Seal kit for Crosman 137. Requires old valve cap and pump piston on exchange. This kit includes, CRS130-032, CRS130-034, CRS130-035, CRS130-036, CRS130-056, CRS140-058, CRS760-042, and CRS1400A029. CLICK HERE FOR MORE INFORMATION AND EXCHANGE INSTRUCTIONS.