The purpose of the circulation sleeve is to selectively allow the flow of fluids between the bore and the annulus of a subsea test tree. When the subsea test tree is being deployed, the circulation sleeve provides a high-pressure 15,000 psi barrier. When desired, the circulation sleeve is “opened” which allows fluid to be circulated between the bore and the annulus through a large diameter. Because of the innovative design, the sleeve can be opened under full 15,000 psi pressure differential. Additional features include 17G design and qualification, the use of NACE material, a shortened design, and the incorporation of 22 hydraulic feedthroughs.