it's made of plastic, which might make you wonder. However, I tried it on my boat today, and it worked 100x better than the 12 volt extractor I used for a few years. Silent too! I was really surprised at the amount of suction it gets. Once I got the hang of it I found it was easiest to get suction going with 10 or so pumps and then every 10 seconds or so give it another pump to keep it flowing at maximum. Sucked all the oil out with no problem. And unlike the my previous one, not a drop of oil was spilled because it pumps straight into the container! Definitely recommend it to anyone that is performing the occasional maintenance.