Highly effective substances must meet the highest standards of purity and potency. For this reason, they require effective protection for the product, but also for the operating personnel and the environment. The patented TKS flap system guarantees a contamination-free product transfer between two containers. It provides dust-free product transfer even with substances with high OEL or OEB requirements and even up to the requirements in the nanogram range. The intelligent flap technology ensures maximum safety for products, people, and the environment.