7+ Water test and leak detection 1. After connecting all pipes, please dis-assembling the plastic protection cover, and switch on/off the cartridge, check all connections without any leakage, and all connections connecting to the required functional outlets. the plastic protection cover to the valve. 8. Wall tiling program 1. Use parallel ruler to make sure the wall and valve being parallel. 9. Cover and handle installation | 1. Take off the plastic protection cover. 2.