You do not mention what make faucet we are talking about.
Moen makes two styles of Shower valves
The one that you discribe is called a Posi-Temp the goes from off to cold and to hot as you turn the valve counter clockwise.
The pressure should be greater mid range ans the cold and hot water mix but generally not noticeable.
A Moentrol valve is that should have been iinstalled in order to have greater control on temp and pressure.
Moentrols work but turning the valve clockwise for cole and counter clockwise for hot and pulling out on the valve for the water to come on.
sanray
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the new shower control should be from off-cold-hot.
when you turn it on it shoudl be cold, and it gets hoter as you turn to left.
there is not adapter for this, the control was design to that.
Was the old handle a round knob style? New one go on with a set screw underneath or screwed on through the knob under a cap?
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