How to replace the heat seal strips 1. Unplug the power cord,using the tools to loosen the screws on the sealing machine 2. Remove the old heat sealing strip and heating element 3. Install a new heat sealing element 4. Then tighten the screws Multiple Use - Ideal for sealing plastics bags, PE bags, PP bags,Aluminum Foil bags and almost all packing bags in household, restaurants, supermarkets, small factories and retail stores like grocery store , medicine shop, candy store, cafe shop, and snack booth etc. Sturdy Seals ensure that your products are moisture-proof and tamper-proof. 2-Step to Use First, Set temperature grade according to bags thickness by turning knob, Second, put bag on high-temp. cloth and press down sealing machine’s handle and last 1-2s to seal; NOTE: No warm up time needed!