Steel Pipe Stopper 75mm

The 75mm (3″) Steel Expanding Pipe Stopper is a robust mechanical bung designed for sealing pipes and carrying out low-pressure air or water tests. Manufactured from zinc-plated steel with a natural rubber seal, it provides a durable, heat-resistant, and corrosion-proof solution for demanding drainage and utility applications.

Heavy Duty Zinc Plated Steel Frame: Built with a rugged steel central stem and plates that resist mechanical deformation and corrosion in damp trench environments.
Expandable Natural Rubber Perimeter Ring: Features a high-grip rubber sealing rim that expands uniformly against the inner pipe wall to form a gas and watertight block.
Threaded Steel Nominal Bypass Nipple: Outfitted with a central hollow half-inch thread and removable sealing cap to allow controlled water drainage or air testing connections.
Mechanical Wing Nut Locking Assembly: Employs a smooth twin-lip compression nut that tightens manually to compress the plates and expand the plug quickly without complex tool setups.

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Full Description

Engineered for the rigours of the UK construction and groundworks sectors, the 75mm steel pipe stopper offers a high-strength alternative to nylon or aluminium plugs. It is particularly effective in environments involving prolonged water immersion, elevated temperatures, or exposure to acidic and alkaline substances. The stopper features a central steel spindle with two plates that compress a thick rubber ring when the wing nut is tightened, creating a secure, leak-proof seal against the internal pipe wall. This mechanical stopper is fully compliant with BS8005 standards for low-pressure testing and sealing. It is equipped with a hollow shaft and a removable 1/2" blanking cap, allowing it to be easily converted for air testing by attaching a standard test nipple or hose. Its wide expansion range (73mm to 85mm) ensures a versatile fit for various pipe materials, including PVC, clay, and cast iron, while the zinc plating ensures it can be reused for many years if maintained correctly.

FAQs

What are the primary uses for a 75mm steel pipe stopper on site?

A 75mm steel pipe stopper is used to blank off, seal, or pressure-test small-diameter steel, iron, clay, or plastic pipework during drainage installations and repairs.

How does a mechanical steel pipe stopper create a tight seal?

Tightening the central wing nut compresses a heavy-duty rubber ring between two steel plates, expanding the seal outward against the inner wall of the 75mm pipe.

Is a steel pipe stopper resistant to site chemicals and wastewater?

Yes, the robust zinc-plated steel construction and durable rubber ring are designed to withstand exposure to water, effluent, and common chemicals without rusting or deteriorating.

What pressure rating does a 75mm steel mechanical stopper support?

Mechanical steel stoppers provide a high-pressure seal suitable for standard air and water pressure testing in accordance with UK building standards and drainage regulations.

Can this 75mm steel stopper be used for pipe testing as well as blanking?

Yes, available in both solid blanking and bypass options, the bypass version allows air or water to be pumped through for testing or controlled drainage.

Can I hire a 75mm steel pipe stopper along with other testing equipment?

Yes, we maintain a complete selection of steel mechanical stoppers and drain testing kits within our hire fleet, ready for immediate dispatch to your site.