Meco engineers have designed an effective solution for the unique sealing problems posed by airlocks and rotary valves. The “Meco-Pac” seal is designed to fit inside the stuffing box, replacing the packing, and is adjusted with the original packing gland follower. The seal can often be installed with no equipment modification. Once installed and adjusted, it can provide years of leak-free operation with little or no maintenance. The Meco-Pac is custom-engineered for service with a wide variety of products, including dry foods, abrasives, hazardous and toxic materials.