tubing head made of alloy aisi 4130 nb: 7-1/16 9",11" etc tubing head wp:14-105Mpa tubing head spool api 6a certified fty tubing head made of alloy aisi 4130nominal bore: 7-1/16 ,9,11,13-5/8 etc tubing head spool for wellheadrated working pressure: 3M,5M,10M wellehad tubing head spoolPSL: 1-3 for tubing bonnet spoolT/C: L.UM/C :AA-FFdelivery: china fob shanghai portcustomers' design : we welcome ...