The poly foam pigs are usually made in the full OD of the pipeline. Polly pigs have the ability to negotiate short radius, ells and bends, Miter Bends, tees, Multi –dimensional piping and reduced port valves. Length can be increased to allow maneuverability through large tees, Some older Orbit value designs and other type gate valves. Poly Foam pigs are great for sealing and light abrasion removal and can reduce in diameter up to approximately 35%.