... gas, water, drilling fluidDetailed description *Spherical blowout preventers are compact, annular type BOPS which seal ... metal-to- metal contact. This feature prolongs preventer life.Suitable for H2S service. Standard models ... design provides long stripping life.USAGE:•Annular blowout preventer uses and hydraulic control systems supporting the ... wellhead. API 16A annular/spherical blowout preventer