A protective apparatus for use with a filler gun having in sequence a barrel, a head, and a handle, includes a protective body. The protective body includes an outer shell surrounding at least a portion of the filler gun. The outer layer is made of a hard material so as to resist scratching,...http://www.google.com.hk/patents/US5823237?utm_source=gb-gplus-share專利 US5823237 - Protective cover for a fuel pump filler gun and method for protecting same 
