Huntingdon Fusion Techniques HFT® also provides Pipestoppers® Steel Plugs and Stoppers in all plug sizes for more arduous duties.  These HFT Pipestoppers® Steel Drain Test Plugs are typically suitable for long immersion in water, for use at higher temperatures or for contact with acidic or alkaline environments for which the nylon, aluminium and inflatable plugs may be unsuitable.

HFT Pipestoppers® Steel Test Plugs can be used for low pressure testing and plugging all pipes, pipelines and pipe work fabrications and any other orifices between 2 to 48″ (50 to 1200 mm) diameter.


The HFT Pipestoppers® Steel Test Plugs and Stoppers are extremely easy to use: Merely insert the Plug into the pipe and tighten the wing nut to move the top and bottom plates together, thereby expanding the rubber ring to seal tightly in the pipe. A patented friction-free washer allows for easy tightening of the wing nut.

The HFT Pipestoppers® Steel Test Plugs and Stoppers are suitable for the more arduous tasks such as:

• Contact with acidic or alkaline environments.
• For long immersion in water.
• Use at higher temperatures.

Where plugs might be required to work close to the top of their pressure range and to hold seals longer than would be the case with single plugs, we offers Pipestoppers® Double Length Steel Plugs and Stoppers.

With the HFT Pipestoppers® Double Steel Testing Plugs, the pressure capability of the Plug increases, the double plug preventing tipping (like a ‘butterfly’ valve) to guarantee the seal. They are more secure at the highest point of their pressure range and give more stability inside the pipework, giving a greater guarantee of the seal.

All Plugs conform to Quality Standards BS8005 and BS EN752-4 for low pressure testing and sealing of pipes.


HFT Pipestoppers® Steel Test Plugs and Stoppers are available in sizes 2 to 48″ (50 to 1200 mm) and are manufactured with outlets according to their diameters.

Outlets on the Plugs (for gas or liquid connection):

Plug Diameters up to 150 mm (6″)
• 12 mm diameter outlet (0.5″ BSP)

Plug Diameters 200 to 450 mm (8″ to 18″)
• 25 mm diameter outlet (1.0″ BSP)

Plug Diameter 500 mm (20″) and upwards
• 50 mm diameter outlet (2.0″ BSP)

The standard seals are made from natural rubber although specific synthetic seals are available for applications where greater chemical resistance and/or higher temperature operation is required. The natural rubber rings can be used up to 80˚C (176˚F) in continuous use. For higher temperatures, we supply rings made from silicone that can be used up to 300˚C (572˚F) and viton, which can be used up to 350˚C (662˚F).

Synthetic seal options are Silicone, Nitrile, Neoprene and Viton.

These HFT Pipestoppers® Steel Test Plugs and Stoppers can be used as Drain Test Plugs, Sewerage Test Plugs, Waste Test Plugs, Plumbing, Welding Purge Plugs and many other applications.