Features: *1. 100% brand new *2. Barbed connector for a firm fit *3. Upgrade# version has built-in one-way check valve to avoid backflow. *4. Easy to use, just squeeze several times to pump the liquid. *5. Scope of application: Automobile, helicopter, ship, motorcycle and other fuel systems. Description: *1. Version: Standard/Upgrade(with check valve) *2. Material: rubber and aluminum alloy *3. Size: 6mm/8mm/10mm/12mm *4. Opening Pressure: 0.2 bar *5. Working Pressure Range: 0.2-6 bar *6. Operating: -30 to +130 Package Includes: 1 x Bulb Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.