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Cherne Multi-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.

  • One plug fits multiple pipe diameters
  • Made of natural rubber for excellent expansion and memory
  • Seals both round and out-of-round pipe
  • Removable inflation valve can be replaced if damaged or replaced with quick disconnect fitting
  • Use to block flow or as a back plug for sewer air testing
  • For blocking the flow of water or sewer lines
  • Effective on all types 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 1 or 2 eyebolts for attaching a lifting line
  • Bendable to 90 degrees

  • Sewer Testing/Long-Term Testing
  • Inflation Pressure: 20 psi
  • Fits Pipe Size: 7"-12-1/4"
  • Maximum Back Pressure: 11 psi/25 ft
  • Size: 8"-12"
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Manuals (1)
Product Type:

Test Plug


8" - 12"

Max Pressure (PSI):





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