Proform 66766 Blue Adjustable Piston Ring Compressor<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Used for increasing the pressure and density of gas</li><li>Friction type brakes to hold the rings</li><li>Highly reliable</li><li>Used extensively</li><li>Easily installed</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41k1A9eYaqL.jpg" noproxy>