I bought this to transfer fuel from my motorbike to my car in the great fuel panic of '21 (I forgot to be a panic buying d***head). It worked just fine. There are no instructions but it is easy enough to figure out. Stick the solid tube where you need to get liquid from and the flexi tube where you want it to go. Make sure the cap is screwed on tight ,and squeeze the bulb. If the flow stops, squeeze again. Job done. It is made to a price and won't last forever, but this is maybe the second time in my 55 years on the planet that I have needed to siphon fuel, so I'll forgive it.