PMP box, PPCO cover, PELD plug. Stain, fix, destain and handle electrophoresis gels and membranes with less chance of damage than conventional methods. Hold 500 to 750 ml of liquid when a gel is in place. Both box and cover will resist temperatures from - 70 to + 70 °C and have good chemical resistance to acids, bases and select organic solvents. Allow easy liquid drainage with minimal gel handling. Plug will not interfere with the cover or the contents of boxes.