A term used to identify oilfield wellhead equipment used offshore and below the surface of the water.

An abbreviation for 3,000 pounds per square inch (psi) Maximum Service Pressure.

See Double Extra Strong.

See Fluoropolymer Coating.

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See also, Certifying Authority. A well-known Certifying Authority organization that may be engaged to certify oilfield equipment components and systems. They can verify equipment designs, witness manufacturing processes, and review and stamp documents as in compliance with industry standards and regulations.

Any flange that will connect between two other flanges that would otherwise not connect. Usually a Double Studded Adapter (DSA), or a Single Studded Adapter (SSA).

A unit of pressure control equipment with a body and two different end connections used to connect together other pieces of equipment that could otherwise not connect. Sometimes used instead of a Double Studded Adapter because at least one of the units to which it connects has a studded flange connection.

See Made in U.S.A.

Marking allowed to identify an API specified test port used in 15,000 psi and higher working pressure equipment. Alternatively, this connection may also use the marking 1-1/8-12 UNF-2B, or F562C. See also Autoclave.