Easy Operate: Pass the white adjustable hose clamp and the spring through the hose, attach to the pumps per the flows arrows, insert the brass nozzle into the liquid source with fixing retainer clips, squeeze the pumps to start siphoning, and use the clamp to control or stop the flows Suitable for transferring oil, and none potable water for cars, boats, generators, and lawns mowers Not for drinking water, edible oil, or liquids Features a brass nozzle for efficient and stable transfer in various applications Easy to Use: Simple step by step setup allows quick and easily transfer with adjustable flows control Features a 5 / 8in large diameter PVC hose and high elastic hand pumps that can moves several gallons per minutes under proper height difference Ideal for quick fuels or water transfer between containers, Manufacturer: YanFengPro