4 Inch 100mm-110mm Drain Testing Plug & Water/Air Test Bung

4 Inch 100mm-110mm Drain Testing Plug & Water/Air Test Bung

Features

The 4-inch (100mm–110mm) drain testing bung provides a heavy-duty, reliable sealing solution designed specifically for water and air testing on drainage systems and waste pipes. Manufactured with an adjustable expansion range spanning from 95mm to 110mm, it creates an airtight and watertight seal inside pipes when tightened via its easy-to-use nylon butterfly bolt. Furthermore, it features a standard 1/2-inch BSP connection thread (measuring 21mm) that comes pre-capped with a secure sealing washer, making it fully versatile for pressure gauges or release valves if required. Because it allows plumbers and DIYers to efficiently check for leaks and test pipeline integrity, it is an essential tool for compliance checks and routine maintenance.

• Adjustable Expansion Range: Expands securely from 95mm to 110mm to fit standard 4-inch / 100mm / 110mm pipes. Therefore, it accommodates slight variations in pipe internal diameters seamlessly.
• Water and Air Testing Capable: Engineered for professional pressure testing on drainage networks and waste pipes. Consequently, it holds pressure reliably during both air and water test procedures.
• Nylon Butterfly Screw Bolt: Equipped with a durable, corrosion-resistant nylon butterfly bolt and thread. Moreover, it allows you to tighten or loosen the bung by hand without needing specialized spanners.
• Standard 1/2″ BSP Connection: Features a 1/2-inch BSP threaded outlet (21mm) complete with a washer cap. As a result, it easily adapts to pressure testing equipment and manometric gauges if needed.
• Heavy-Duty Pipe Seal: Compresses tightly against the pipe interior to prevent slippage under test pressure. Furthermore, it ensures a dependable, leak-free seal throughout the duration of the test.

Technical

• Brand: Horobin
• MPN: 74061
• Product Type: Drain Testing Bung / Pipe Test Plug
• Pipe Size Compatibility: 4″ / 100mm / 110mm
• Expansion Range: 95mm to 110mm
• Testing Application: Suitable for water and air pressure testing on drains and waste pipes
• Connection Thread: Standard 1/2″ BSP (approx. 21mm) with washer cap
• Bolt Material: Nylon butterfly bolt and threaded shaft

Details

Testing newly installed or repaired drainage systems for leaks is a critical step to ensure compliance with building regulations and prevent future structural damage from wastewater failures. Moreover, using an ill-fitting or poorly secured test plug can cause pressure drops, false test readings, and dangerous slippage during air or water tests.

Fortunately, this 4-inch adjustable drain testing bung solves the problem completely. Because its rugged expansion mechanism spans 95mm to 110mm and locks firmly in place using a convenient nylon butterfly bolt, it forms an absolute barrier against pressure loss. Consequently, you achieve accurate, professional-grade test results and total confidence in your drainage installation.