Can I change the trim (showerhead, arm, flange, escutcheon, handle/knob and tub spout) without changing the valve in the wall?
Replacing the trim on an existing Moen tub/shower can be accomplished by first determining what kind of valve is in the wall. For many years Moen tub/shower valves have been manufactured using one of three valves. These valves are Standard, Posi-Temp and Moentrol. Although the look is similar, the trim is not necessarily interchangeable. To determine if the trim can be changed without changing the valve in the wall, the first step is to identify what type you have. This chart(section) shows the differences. Note:Posi-Temp trim and Moentrol trim are not interchangeable. Figure 1 shows that the screw holes at the 5:00 and 7:00 position. This is a Standard valve that features a pull on/push off operation and turns left and right for hot and cold. Figure 2 illustrates the pressure balanced valves. Models that have a lever or knob that rotate only are called Posi-Temp. This “cycling valve” handle is pointed towards the 6:00 position when off, rotates to the 3:00 position for cold, 12:00 for
