This is an authentic Jet replacement part manufactured for use with sand rammers. The o-ring is used to seal the throttle valve cap. This o-ring is available as an individual replacement part, please see model diagram for associative parts.
This part is available as an individual replacement. The spring pin goes next to the valve seat and is made out of metal. A set of pliers might be needed during the installation process. This item may become bent or broken and will need to be replaced. It is an original Jet part for use in sand rammers.