Professional Exhaust Valve Body Removal Tool for the Exhaust Valve on older Sheridan and Benjamin airguns. This tool is more efficient and advantageous than the Combination Tool if you are repairing more than one airgun. If you cannot remove the square nut, you will need the SHET4 tool instead. This tool is useful to remove the valve on all the Benjamin airguns made in St. Louis, all the Benjamin, Benjamin/Sheridan, and Sheridan airguns made in Wisconsin. It is only useful on some made in NY during the first year that they were made in NY. If you are not sure if are not sure about this tool, start to disassemble the gun and look in the back of the compression tube, If you see the square hole in the center of the nut, you this tool will work on your airgun.