Dear Alice,We want Mazzoni to improve the structures of high pressure washers as below:1. Change the blue tube position from below to the front and fixed it stably.For rats often bites them awfully in farms which are main industries we sold. 2. Wonder the four lights’s fuction of KC5000.3. Redesign the shell of KC5000 as a back flip, with one screw in the front, and the back can be turned over directly.For changing the oil and checking the amount of oil easily. Our customers kept reflecting this problem.