Grayloc tubing joint

Grayloc tubing joint

[′grā·läk ′tüb·iŋ ‚jȯint]
(petroleum engineering)
Special wellbore-tubing joint that has greater leak resistance and strength than standard API tubing joints.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.