Patent ID: 7213290

Claim:
A pig for bidirectional movement through a piggable line of a coating delivery system for cleaning an internal surface of the piggable line, comprising: said pig integrally formed from a resilient material, and including a central body portion symmetrical around a longitudinal axis, flexible sealing lips integral with and extending longitudinally and radially from opposed ends of said central body portion extending in opposite longitudinal directions each including an outer surface having a radially extending scraping edge biased against an internal surface of the piggable line for cleaning the internal surface, and end portions integral with and extending longitudinally from said opposed ends of said central body portion beyond free ends of said flexible sealing lips coaxially aligned with said central body portion having an outer diameter less than an outer diameter of said central body portion and an inner diameter of said flexible sealing lips, spaced radially from said flexible sealing lips, and said end portion each having a flat end face spaced longitudinally from said flexible sealing lips for engaging another pig without longitudinal or radial displacement.