... drilling 3.Material:forged steel/cast steel API double Pipe rams bop Standard:API 6AApplication:well drillingMaterial:forged steel/cast steel ... is mainly composed of housing, side gate, hydro-cylinder, cylinder cap, piston, piston rod, lock shaft, sealing parts, ram, etc. Oil ... (union, manifold,elbows).4)Bop(Annular/ram) API double Pipe rams bop