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The H-Plug is a newly designed nylon watertight locking expansion plug. It allows you to use a special wing shaped key (sold separately) for security purposes. Nylon watertight expansion plug that is similar to the Torquer.
Enviro Design Products is an authorized distributor of Koby Environmental's high-quality American made products. Koby Environmental has been designing, engineering, developing and manufacturing environmental groundwater and soil testing equipment since 1989.