Product recovery technology increases product yield and reduces losses. Efficient pipe draining also saves enormous amounts of water for flushing. As a result, the output of wastewater is reduced. Due to rapid draining with a pig as opposed to flushing, downtimes are reduced and operational readiness is increased. Efficient use of resources and energy also promotes sustainability and protects the environment. Product recovery technology is used in various industries. The advantages are particularly obvious when handling highly viscous, sticky or poorly soluble products. The food and beverage industry uses the technology in the processing of pasta, concentrates for soft drinks, or chocolate. The technology is suitable in the chemical industry for the production of paints and coatings as well as cleaning agents and adhesives. In the pharmaceutical industry, product recovery technology optimizes the production of pastes and ointments. Product recovery technology is also used in the cosmetics industry for the production of shower gel or creams. In addition to pipe draining, pigs can also be used to protect the product against mixing with water or contact with oxygen. The process is based on the seal between the pig and the pipeline. This ensures that no medium can flow past the pig. Driven by pressure energy, the pig traverses the pipeline system, displacing its contents. The required energy is provided via a liquid or gaseous propellant. A constant pipe diameter is required along the entire route to be passed along. There must be no fixtures or bottlenecks in the system that can block the pig. Smooth and offset-free pipe connections protect the pig and reduce wear. The pig slides on a liquid film during its passage. Operation in dry conditions is not possible.