Works great just filling the Marauder from 2000 to 3000 psi. Anything beyond that is a waste of time. I bought it to fill a 350ml carbon bottle. CM from 2500 to 4500psi. I have to stop and cool the pump about 8 times to get it to the mark. So it takes about an hour for 1500psi in a 350ml bottle. I don't let the pump get anywhere near the 195 degree mark that the pump will go to. My final thoughts, this is a 100% waste of money. Should have spent another $200 and gotten a bigger pump