4" / 100mm Steel Drain Test Plug

Ensure secure and reliable pressure testing of drains and sewers with the 4" / 100mm Steel Drain Test Plug. Manufactured in the UK by Horobin, this robust test plug combines durability with practicality, making it an essential tool for drainage professionals. Perfect for pressure testing drains and sewers, it’s designed to ensure accurate and reliable results in testing systems for leaks and weaknesses.

Why Choose the Horobin Steel Drain Test Plug? 

Strong and Corrosion-Resistant Design:
Crafted from zinc-plated steel, the Horobin Steel Drain Test Plug offers exceptional corrosion resistance, tested to withstand up to 90 hours of salt spray exposure. The steel plates provide maximum strength, while the brass wingnut ensures a secure, adjustable fit for pipes of various sizes.

Versatile and Reliable Testing:
Ideal for pressure testing drains and sewers, this test plug fits pipes with an internal diameter range of 94mm to 108mm. Whether referred to as a Drain Test Plug, Drain Testing Plug, Drain Test Bung, or Drain Pressure Stopper, this tool ensures an airtight seal, crucial for reliable testing of drainage systems.

Key Features:

• Zinc-plated steel plates — corrosion-resistant for up to 90 hours of salt spray exposure
• Brass wingnut — for a secure, adjustable fit
• 1/2" outlet — suitable for pressure testing applications
• Fits internal pipe diameters: 94mm - 108mm
• Minimum insertion depth: 37.5mm
• Maximum allowable back pressure: 10 p.s.i.
• Approximate weight: 0.41kg

Easy-to-Use Testing Equipment:

The Horobin Steel Drain Test Plug is simple to install—just insert the plug into the pipe and tighten the brass wingnut to create an airtight seal. It works seamlessly with air test kits and manometers for effective pressure testing, helping to identify leaks and weaknesses in drainage systems. 

Note: Depending on your testing setup, you may also require a 1/2" nipple cap to ensure a secure seal at the exposed end of the test plug.

Trusted by Professionals for Reliable Performance:

Designed for use in pressure testing drains and sewers in line with BS8005 and EN1610, the Horobin Steel Drain Test Plug is relied upon by plumbers, drainage engineers, and contractors for its accuracy, strength, and longevity.

Looking for additional testing equipment? Explore our range of Air Test Kits and other test plugs, or contact us for expert advice.