The PolyScience 300 Series Chamber Vacuum Sealer has been specifically designed to bring the features of a commercial vacuum sealer to both professional and home kitchens alike. Unlike strictly commercial units that require oil changes, the unit features a maintenance-free dry piston pump. The 300 Series Chamber Vacuum Sealer effortlessly seals liquids and moist foods. Three preset cycles can be programmed to provide the exact vacuum levels, vacuum hold times and seal times for meats, fish and infusions. A built-in marinate cycle broadens your abilities even further. An external vacuum port lets you vacuum seal both bags and canisters. Keep food fresher, longer in the refrigerator, freezer or pantry by vacuum sealing. Vacuum sealing eliminates waste, reduces food cost, makes meal preparation faster and easier and enables stocking up on sale or bulk purchases.