Please note that the API Monogram Program effective date for the this document's next edition is September 2021. Until then, this edition will still be considered active and not historical.This specification establishes the minimum requirements for the design and manufacture of the following types of new equipment:a)articulated choke and kill lines;b)choke and kill manifold buffer chamber;c)choke and kill manifold assembly;d)drilling choke actuators;e)drilling choke controls;f)drilling chokes;g)flexible choke and kill lines;h)union connections used in choke and kill assemblies;i)rigid choke and kill lines;j)swivel unions used in choke and kill equipment.These requirements were formulated to provide for safe and functionally interchangeable surface and subsea choke and kill system equipment utilized for drilling oil and gas wells. Technical content provides the minimum requirements for performance, design, materials, welding, testing, inspection, storing, and shipping.