The Apache MDPB (medium density plastic brush) and MDPB DD (medium density plastic brush, double dish) are lightweight open cell foam pigs designed for cleaning and drying pipelines. The Double Dish is ideal for bi-directional operations and evacuation of liquids. MDPB foam pigs are one of the most cost effective, durable designs of pipeline cleaners in the market today. Most commonly used in internally coated or lined pipelines.