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Cherne Single-Size Underground Test-Ball Plugs offer an economical pneumatic plug option for blocking flow, allowing for maintenance in sanitary and storm sewer systems. These plugs may also be used as a back plug for sewer air tests.

  • Designed for flow blocking of water or sewer lines
  • Durable, rugged and effective in any type of pipe
  • Uses rupture disc technology which prevents over inflation of the pneumatic plug
  • Utilizes a standard tire air fitting for easy connections
  • Removable chains are standard on sizes through 6"
  • Larger sizes include one or two eyebolts for attaching a lifting line
  • Bendable to 90°

  • Application: Pressure Testing, Blocking, Repair, Maintenance, Installation
  • Inflation Pressure: 25 psi
  • Fits Pipe Size: 8"
  • Maximum Back Pressure: 17 psi/40 ft.
  • Size: 8"
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Product Type:

Test Plug



Max Pressure (PSI):





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