【Metal Valve and Size】Rubber fuel primer bulb (8mm) for gasoline and diesel. Valve size: 151 x 42mm. Ideal for quick, easy, and leak-free fluid transfers. 【Premium Material】This fuel primer bulb is made of corrosion-resistant, oil-resistant, and wear-resistant rubber and aluminum alloy, ensuring a long service life and smooth transmission of various liquids. 【Ease of Use】Built-in one-way valve to prevent backflow. Simply connect the hose and squeeze the pump for smooth flow in the desired direction (check the arrow direction before use). 【Wide Applications】Diesel primer bulb suitable for ships, vehicles, lawnmowers, tractors, motorcycles, aquariums, etc. Suitable for gasoline, diesel, oil, water and other non-corrosive liquids. 【Note】Make sure the liquid is above the receiving container for optimal performance. Not suitable for corrosive liquids or containers with anti-theft filters.