The pump is fitted with Viton hydraulic seals with a captured vent and secondary seal in the hydraulic cylinder making it suitable for use with a wide variety of corrosive and flammable fluids. Alternative seals are available on request. Specially modified air regulator limits ouput pressure to 200 PSI. Closed loop hydraulic system returns fluid to the inlet side of the unit instead of to drain. This can also be used to bypass the pump allowing fluid to fill the test specimen quickly without the pump operating. All wetted parts are manufactured from stainless steel.