1. The stainless steel chamber with welding handle can maintain airtightness for a long time. (After long-term operation, a typical through-hole handle may cause leakage) 2. The top of our chamber has a rounded edge to protect the silicone gasket. 3. The vacuum gauge is assembled on a separate port, so the reading remains accurate even when pumping/venting the chamber. 4. All kits have to go through a 24 hour vacuum test before packaging. (24-hour leakage is less than 2.0 inches of mercury) 5. Double-sided reversible vacuum gasket, with better durability and reliability. 6. The gasket is chemically resistant to butane and other solvents. 7. Sturdy food-grade silicone vacuum hose can be easily connected/disconnected from the pump/chamber. 8. Easy to install and low maintenance cost: the cabinet can be assembled in 5 minutes.