The Moentrol valve operates by pulling the knob out to control flow. Once the knob is pulled out to turn the water on, it is then rotated to select a temperature. Left for hot, right for cold, or a mixture of both in the middle. Once the faucet is done being used, you can turn it off by pushing the knob straight in. The PosiTemp valve does not pull out. To turn on the water flow the handle is rotated counterclockwise. You turn the handle counterclockwise until water dispences. The water starts at the coldest setting. To change to a higher temperature you keep turning the knob counterclockwise. All the way counterclockwise would be the hottest temperature setting. To turn the faucet off turn it all the way back clockwise to the off position.
The Moentrol valve is more expensive then the PosiTemp for the added feature of Temerature Control where you can set the temperature so it is always where you like it. Check out the Moentrol valve and PosiTemp valve by Moen Faucets. Brought to you by The Faucet Expert (TM). Videos.