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An annular packing gland fitting between the drill rod and the casing at
the borehole collar. It allows the rod to rotate freely but prevents the
escape of gas or liquid under pressure. Esp. utilized when drilling with
counterflow; when drilling in an area where a high hydrostatic pressure or
flow of water may be encountered, as in drilling a cover or pilot hole; or
when drilling up holes from an underground drill site. Long
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