Bazsites.com Pipe Plugs

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Buchen Inc - Manufacturer of inflatable pipe plugs, bypass plugs and accessories used for testing, plugging and bypassing in sewer lines.
Cherne Industries - Manufactures and sells pipe plugging and testing equipment, pipe lubricant, primers, and cements .
Sarco Stopper Limited - Manufacture under pressure pipe stoppers and bagging-off systems for gas, water and other service pipes. Allows repair of pipes without loss in supply. Available world wide.
Mechanical Research - Source for inflatable and mechanical pipe test plugs, inflatable and annular seals as well as bulkheads.
Petersen, Inc. - Distributor of specialty pipe plugs for pipeline and plumbing contractors.
COB Industries, Inc. - Specializing in pipe freezing, pipe plugging, pneumatic saws and pruning machines, compact pipe threading machines, magnetic drill presses and annular cutters. Description of products, company information and news.

Plug flow - In fluid mechanics, Plug Flow is a simple way of modelling flow of a fluid in a pipe or, more generally, a reactor. Essentially no back mixing is assumed with "plugs" of fluid passing through the reactor.