This Air Tool Oiler is used in-line between your air hose and your tools. You simply fill it's reservoir and you're done. <table border="1" width="320"> <tbody> <tr> <td style="text-align: center;" width="80"><strong>Day:</strong></td> <td style="text-align: center;" width="80"><strong>Weekend:</strong></td> <td style="text-align: center;" width="80"><strong> Week:</strong></td> <td style="text-align: center;" width="80"><strong>Month:</strong></td> </tr> <tr> <td style="text-align: center;" width="80">8$</td> <td style="text-align: center;" width="80">12$</td> <td style="text-align: center;" width="80">32$</td> <td style="text-align: center;" width="80">96$</td> </tr> </tbody> </table>