Model 720 envelope sealer automatically seals both nested and un-nested envelopes. Feeds and separates envelopes of different thicknesses at speeds up to 300 envelopes/min. Heavy-duty, user maintainable (minimal cleaning) system with stainless sealer that eliminates rust and requires no calibration. Optional electronic counter. 720 L sealer is similar to Model 720, but designed to accommodate larger envelopes with an extended tray.