Kit includes all the O0rings in the tool, Plus the Cylinder Seal 402725.
Paslode Wide Crown S150-W16R O-ring + Seal kit
O-ring kit + 402725 Seal for the PaslodeS150-W16R
Ships with Schematic and O-ring reference sheet
Ships Free in the US
Also on ebay Paslode S150 O-ring and Seal Kit
Make: Paslode
Model: S150-W16R
Part #: 501270