AESSEAL Pumppac Forced Oil Circulation System This is a Used AESSEAL Pumppac Forced Oil Circulation System which operates by cool barrier fluid is pumped from the pumppac to the mechanical seal, the barrier fluid then passes through the mechanical seal & back to the pumppac where it is cooled, the back pressure control valves controls the pressure in the line. the system is currently held in stock at Lockerbie, Scotland