Heavy Duty Sealers – Side Acton. Two types of sealers, Side Action and Front Action. Front Action – Front-action sealer handles are held perpendicular to the strapping, usuallyin front of the operatorwho pushes the handles together close to the chest. Generally for light-duty strapping applications. Side-Action Sealer – The side-action sealers lower handle can be rested on the flat surface of the unit being strapped. Operators can apply much of their weight with both hands on the upper handle. Generally for heavier strapping applications.