The back story on this unit: Purchased new in summer of 2023. I put somewhere around 4-5 hours on it then and it performed flawlessly. I went to use it again recently after cleaning the check valve and changing the coolant and found it wouldn't pump past 200 bar with the OEM 12V inverter. Purchased a new power supply off amazon and that got the unit to about 240 bar before it stalled out.. I also tested the unit with a fully charged car battery and that got it a bit further pressure wise. I had purchased a warranty on it and they replaced the unit. I don't have the time to mess around trying to fix this one. I can ship in the original box but no power supply INCLUDED. If someone wants to send me $100 I'll ship it to you. If not it's going to Goodwill.