The Heavy Duty Motorhead Assembly(HDMHA) combines the double flapper check valve, heavy duty hydraulic disconnect and dual circulation valve. HDMHA is specially designed for milling and fishing operation. Double Flapper Check Valve-The HDMHA incorporates two flapper cartridge assemblies. Each flapper cartridge assembly incorporates metal to metal seal for high pressure, and a rubber seal for low pressure sealing. Heavy Duty Hydraulic Disconnect-The heavy duty hydraulic disconnect is suited for high torque, heavy duty drilling operation. The heavy duty

hydraulic disconnect allows the tool string to detach at a predetermined pressure by dropping a ball through the coiled tubing. Dual Circulation Valve-The dual circulation valve offers the traditional method of establishing circulation of the tool string through use of a drop ball.