Equipment Development Company - EDCO- Large asphalt tank Walk behind Portable Crack Joint Sealing Machine SGF 60 ,For more than 55 years, Equipment Development Co., Inc. has been the leader in Surface Preparation, Repair, Restoration and Professional Sawing Equipment. EDCO …High Efficiency Small Road Crack Sealing MachineRS-60 Asphalt Crack Filling Machine Nanjing. Asphalt crack filling machines melt the asphalt and pour the material to seal the road crack. The machine uses liquefied petroleum gas to heat the asphalt tank and asphalt flowing device.