Used it on an automatic transmission, it works great. I placed a one gallon mark on the extraction cylinder and removed exactly that amount, allowing me to replace with a gallon of new fluid. I had no mess or drips, then poured off the old fluid from the extractor pump into the empty trans fluid. No more messy drain pans I used the manual hand pump method, worked easier than expected. I used some rubber caps to cover the hose ends, so no worry about those dripping.