A 12,000lbf (53.4kN) capacity hydraulic jack with 5in (127mm) stroke is mounted in a robust three-column reaction frame constructed of plated steel. Molds are positioned vertically over the piston on a load platform that prevents the emptied mold from falling back over the jack. Daylight opening of the frame is adjustable for mold lengths up to 11.75in (279mm). Specimens longer than 5in are extracted by repositioning the Adapter Ring after maximum piston travel. The spring-loaded piston automatically returns to the start position when the stainless steel knob for the release valve is opened. Adapter Rings are quickly changed with just two wing-nuts, and Extruder Discs rest in place on top of the piston. Optional accessories for smaller-diameter specimens will fit either model. Dimensions for both models are 9.5x10x24in (241x254x610mm), WxDxH.