BOP Blow Out Preventer Stack
This looks to be a medium sized stack. Maybe rated for 10k psi. They make 15k, 20k ones that are much larger. Shaffer 7-1.16 inch 5lb Double Hydraulic BOP Blow Out Preven in Good Condition OIL & GAS BLOWOUT PREVENTER (BOP) STACK “Components Illustration Trainings, 13 Stack LXT seal repair and service The Defining Series: Blowout Preventers | SLB Internal Structure and Working Principle of Ram Blowout Preventer(Ram BOP) ...