Blowout Preventer Stack is the main wellhead pressure control equipment for oil & gas drilling, no matter onshore or offshore drilling. BOP Stack consists of Annular Blowout Preventer, Single Ram Blowout Preventer, Double Ram Blowout Preventer and Drilling Spool. MFF Oilfield supplies BOP Stacks which are Shaffer or Cameron or Hydril type. These are designed and manufactured as per API Spec 16A.