This product is a 5 star product , plain ans simple all these people knocking this product down i guarantee left there bleeder valve open and that why they can't figure out how to use it CORRECTLY, here let me break it down for you I bought one of these and a 400$ actually compressor I took one look at the compressor said yup I don't even want to put it together my hand pump 2 minutes of pumping 1000 psi I read all then directions did all the maintenance as soon as I got it to reassure everything was correctly lubed , moral of the story I choose this pump over my electric Yong hang so to thus seller I hope thus clears up for the lost , the first thing I noticed when assembling this product its made with quality period. If you don't know how to use a hand pump correctly spendnthe 400$ that way your ignorance doest mess with a good seller and product