POP-A-PLUG® CPI/Perma Medium Pressure Tube Plugs

Permanent sealing solution for leaking heat exchanger, condenser and boiler tubes. Pop-A-Plug CPI/Perma Medium Pressure Tube Plugs feature internally and externally serrated sealing rings designed to maintain a helium leak-tight seal under extreme thermal and pressure cycling.

EST Group’s mechanical tube plugs install hydraulically in minutes with a unique engineered breakaway. Controlled installation force limits operator fatigue and prevents damage to the tube, tubsheet and surrounding tubes.

Pop-A-Plug Tube Plugs accommodate a broad range of tube sizes and materials, with full material traceability documentation available to support fossil, nuclear, refining, petrochemical and chemical industry requirements.

Pressure Rating: Up to 1,000 PsiG (483 BarG)

Size Range: 0.472” to 2.067” (11.99mm to 52.5mm) Tube I.D. Larger/smaller sizes available upon request


Tube Plugs are available in a wide range of materials, including alloy steel F11 / F22, standard stainless steel, Zirconium, 904L, as well as 35+ commonly used alloys for corrosive environments, including:

  • SS-316/316L
  • SS-317L/321/347
  • SS-400 Series Alloys
  • SS-904L
  • SS-254SMO
  • SS-20CB3/ Alloy20
  • Duplex SS /Super Duplex SS
  • Inconel /Incoloy Alloys
  • Hastelloy Alloys
  • Monel
  • Nickel 200/201
  • AL6XN
  • CuNi 70/30 – 90/10
  • Carbon Steel A350 LF2
  • Chrome Moly 4142
  • Chrome Moly F5/F9/F11/F22


  • Eliminates welded or explosive plugging methods
  • Resistant to thermal and pressure cycling
  • Lowest lifecycle cost compared to alternative plugging methods
  • Maintains helium leak tight seal to 1 x 10-6 cc/sec
  • Plug material matches tube material mitigating thermal expansion, contraction issues, and undesirable galvanic corrosion
  • Accommodates Through-the-Tube Plugging applications
  • Meets ASME PCC-2-2015* recommendations and EPRI** criteria

For pressures higher that 1,000 PSIg, please look at our Pop-A-Plug high pressure tube plugs