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Inside preventers<br />
An:<br />
kelly cock<br />
inside blowout preventer,<br />
drill pipe float valve, or<br />
drop in check valve<br />
should be available for use when stripping the drill<br />
string into or out of the hole.<br />
The valve(s), sub(s), or profile nipple should<br />
be equipped to screw into any drill string<br />
member in use.
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