This tool can be used as a wrench to remove the cylinder end plug (fill valve housing) allowing servicing of the o ring below. Works with old and new style fill caps (new style pictured).

Fits; s500, s510, Ultimate Sporter and Ultimate Sporter R and Xtra models.

Please note this is a tool that has been modified for use on Air Arms plugs and will show signs where this modification has taken place (bare metal area).