Mechanical Research
- Source for inflatable and mechanical pipe test plugs, inflatable and annular seals as well as bulkheads.
- http://www.mechanicalresearch.com/

Stemar Equipment & Supply Co., Inc.
- For pipeline and utility contractors. Pipe plugs, sewer pipe plugs, pipeline acceptance and testing equipment, pipe leak locating equipment. Also, contractor hardware and supplies.
- http://www.stemarinc.com/

Vanderlans & Sons, Inc.
- Offers a complete line of test plugs and flow-thru plugs in single and multi sizes. Also available are joint testers, high pressure plugs and air and vacuum testing equipment.
- http://www.lansas.com/

Petersen, Inc.
- Distributor of specialty pipe plugs for pipeline and plumbing contractors.
- http://www.pipeplug.com/

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.
- http://www.sarco-stopper.com/

Buchen Inc
- Manufacturer of inflatable pipe plugs, bypass plugs and accessories used for testing, plugging and bypassing in sewer lines.
- http://www.buchen.com/

Cherne Industries
- Manufactures and sells pipe plugging and testing equipment, pipe lubricant, primers, and cements .
- http://www.cherneind.com/