The SWP style was the first pig designed for process pigging. Its eight discs equate to exceptional sealing capabilities resulting in less bypass and more product displacement. The SWP is capable of spanning full-branch tees and negotiating tight-radius bends as low as 1.5-diameter. It is constructed of high-grade abrasion and chemical resistant solid-cast polyurethane material. Material options include neoprene, viton, and epdm.