Operated by turning one switch, QuickChange PT (QCPT) enables screen changes by one person. Carbon and stainless steel construction is available for 48 and 60 in. units, which comes with such features as motor start up interlock, slow raise and lower cylinders, and internally adjustable pressure regulator. Dual air cylinders are self-contained within towers, mounted independently on each side of unit, and end of cylinder rods raise up to engage bracket on cover or frame and lift frame stack.