The TVH.4511 is a 3/4" NPT female connection volume control valve with single output. Handle Operation – The handle is used to control volume of water flowing through the valve. It can be used to set the water to a trickle all the way to full volume flow. This valve does not provide any temperature regulation. Valve Installation – As the valve is installed, care should be taken to maintain proper distance from the back of the valve to the surface of finished tile which should be between 2.77? and 3.44?. Also, the valve must be installed vertical and not at an angle. In case, a tile is thicker, or wall is deep, extensions are used for elongating both handles of the valve to ensure proper setting of the trim (length of extensions for TVH.4511 valve is 1.40? inches). Cut Out Dimensions – The cut out in wall should be 1.65? X 1.65? inches which is properly covered by the trim plate. This will ensure that the trim plate will cover the cut out hole in the wall. Trims – The trims comprise of well finished trim plate and volume control handle knob. The trim plate is used to cover the wall and has markings for ON/OFF for water flow. Any *4511 series trim can be used with this valve. Depending upon the shower model, trims can be of different shape and size, varying from square to circular shower handles.