I bought this airless sprayer to spray my house roof and ran it on water first before using paint to check for leaks in the system. The sprayer was faulty when I first used it as it had water coming into the switch area due to a split oring in the pressure switch allowing water into the switch cover from the valve which was very dangerous. I sent a service request to Vevor then sent pictures and waited a week for the part to arrive. I then installed the part with no instruction provided and the unit then worked fine after this and painted really well. The communication was poor from the service department as they gave no details on replacement from on how to replace the faulty part. It is fortunate that am proficient in mechanics that saved this unit from being unusable. After all this I have used this sprayer, and it is great value for money.