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API

API Spec 6D

Specification for Valves, Twenty-Fifth Edition, Includes Errata 1 (2021) and Errata 2 (2022)
standard by American Petroleum Institute, 11/01/2021

API

API Spec 6A

Specification for Wellhead and Tree Equipment, Twenty-First Edition, Includes Errata 1 (2019), Errata 2 (2020), Errata 3 (2020), Errata 4 (2021), Addendum 1 (2020), Addendum 2 (2021), and Addendum 3 (2022)
standard by American Petroleum Institute, 10/31/2018