Hydrostatic Test & Isolation Plugs

Safe and effective solutions for rapid pipe testing and repairs

EST Group offers a complete line of Hydrostatic Pressure Test and Pipeline Isolation Plugs for pressure testing pipework, pipelines and pressure vessels.

  • Test Open End Pipe, Pipelines, Tubes and Pressure Vessels
  • Perform Flange-To-Pipe Weld Testing
  • Isolate and Test Pipe Connections

Hydro Test plugs for pipe provide safe and effective testing at working pressures up to 15,000 psi (1034 Bar). Pipe OD and ID sealing versions available.

Pipe isolation plugs are designed for quickly isolating and hydrostatically testing weld joints of any welded flange-to-pipe connection as well as isolating pipe ends during cutting, grinding and welding operations.

Also available are hydrostatic test pumps, ideal for use with our entire range of pressure test plugs.





Griptight® pressure tesT & isolation plugs

We offer a complete line of Hydrostatic Pressure Test & Pipeline Isolation plugs for pressure testing and isolation of piping, pipelines, and pressure vessels in high-pressure environments.



We have a wide selection of test and isolation plugs suitable for various applications. 


  • Safe and reliable testing at higher pressures
  • Patented dual-serrated gripper design provides more gripping points on the pipe surface.
  • Hardened shaft, grippers, and cone increases durability, extends service life and reduces wear.
  • Ideal for hardened pipe applications up to HRC 32
  • Reusable, compatible with hydrostatic or pneumatic testing


  • Orientation free installation
  • Save significant time over welding end caps
  • Patented dual-serrated GripTight MAX grippers
  • Patented self-aligning gripper/seal design
  • Fits most long radius elbows
  • Reusable, compatible with hydrostatic or pneumatic testing


  • Monitor potentially explosive vapors during hot work
  • Minimize risk of accidental blowout/expulsion due to improper use
  • Monitor unexpected upstream pressure
  • Uses less than a gallon of water, reducing waste water, treatment expenses, and facilitates testing in remote areas of facilities
  • ASME PCC-2 Type IV testing device


Curtiss-Wright EST Group is dedicated to providing a complete range of lifecycle products and services to maintain and repair open-end pipes, piping systems, tubing, and pressure vessels for the following industries and applications worldwide.


  • Petrochemical & Refining
  • Oil & Gas Production
  • Power Generation
  • Design & Build Projects
  • Shipbuilding Industry
  • Industrial Contractors
  • Module Fabricators


What is a mechanical pipe plug?

Our GripTight® plugs, commonly known as mechanical pipe test plugs. Used in applications where safety is vital, mechanical pipe plugs are actuated by tightening a series of rim nuts around the periphery of the pipe plug, sealing it for protection. 


Hydro Test Plugs, also known as hydrostatic testing plugs are suitable for high pressure testing up to 15,000 psi and also for pneumatic testing. Curtiss-Wright EST Group offers a complete line of isolation and hydro test plugs for pipework testing.