... oil,water,nature gas 2.bottom connection:welded, slips , threaded 3.AA-FF,PSL1-3,PR1 CASING HEAD Casing hanger for casing head and casing ... . The connecting type of casing head and surface casing is weld,tread and slip type. Matched casing hanger structural type:slip,tread ... flange and flange. In the bottom of casing head and casing spool sets casing secondary seal mechanism and sealing test port.skype ...