Ideal for complete drainage of flat surfaces where a sump is not available: rooftops, parking garages, roadways underpasses, service utility pits, basements, plant maintenance cleanup, pools, and spas. Urethane, Semi Vortex Impeller and Wear Parts for maximum durability and maintaining pump performance. Double Inside Mechanical Seal With SiC faces provides the longest operational life. Oil Lifter provides lubrication of the seal faces. (Patented) V-Ring Seal protects mechanical seal from abrasive particles.