A fastener for coupling blowout preventers in a stack including an elongated shaft having a first end and a second end, and a head disposed proximate the first end of the elongated shaft and adapted to be retained in a recess in a first blowout preventer. The second end of the elongated shaft is adapted to be coupled to a second blowout preventer.
https://app.acclaimip.com/pdf/XSEnPC_wDubhISdZyvAO6oqhfg74w02clpVxMVw/US7011159B2
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