You would have to buy an exposed shower valve in conjunction with this product as otherwise you would have no way of controlling the temperature or flow rate.
This particular product will work only with our exposed valve range as there is no concealed installation required.
The majority of our products are manufactured for use in conjunction with other Hudson Reed components. That's not to say that it won't work with your exisiting installation! Why not give us a call and one of advisors will talk you through everything.