Three-way valve body has three, one in and two out, (left in, right and under) and the common valve is different from the bottom has an outlet, when the internal valve in different positions, the outlet is different, such as the core in the lower, left and right communication, such as the spool in the upper, the right exit blocked, left and under the mouth.Because the left mouth and the right mouth are not on a horizontal line.In case of emergency disassembly, the valve is closed and the water is bypassed.