UltraFlow (Field-Installed) Sucker Rod Guides & Paraffin Scrapers Guide Features Full-circle Wiping of Tubing I.D. More Gripping Force on on the Rods More Fluid Flow-by Volume Longer Useful Guide Life due to Longer Vanes & Bearing Surfaces  Positive Wear Indicator Available in Amodel and Nylon, with Glass Fill Hydroplaning effect is Superior with Positive Cavity