A conversion apparatus comprising a first plate and a second plate. The first plate comprises at least one coupling mechanism, and the second plate comprises at least one coupling mechanism. The first plate is configured to couple with a blow-out preventer (BOP) body. The second plate is configured to couple with the first plate a bonnet assembly. A lock ring groove is formed in one of the first plate, the second plate, and between the first plate and the second plate.
https://app.acclaimip.com/pdf/ovYxUkMiUXz99jE3piJRcJauGNcF6rqFn9CKFqM/US7357187B2
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