This Laser Tools Syphon Pump is ideal for all types of siphoning. The tube has a small enough diameter to be used to drain radiators or for topping up antifreeze. The pipe is 1/4 inch in diameter (6.35mm) and the overall length is 1650mm. It features a simple one-way pump action and can be used to siphon petrol or diesel. Laser Tools provide high quality tools to professional tradesmen, hobbyists, and DIYers.