This is a new Stokes 412J pump as received from the factory. It includes a âwater miserâ valve to thermostatically control the flow of cooling water through the pump. MHV has performed a functional test on it, and test results will be provided with the pump. This particular pump was bought through Atlas Copco, who now owns Edwards Vacuum and the Stokes brand. The pump says Atlas Copco on the outside but is otherwise a Stokes 412J pump.