water-sealed holder

water-sealed holder

[′wȯd·ər ¦sēld ′hōl·dər]
(engineering)
A low-pressure gas holder which consists of cylindrical sections or lifts telescoping into a pit or tank filled with water; the inside section is closed in on top.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.