Mechanical Drain Test Plug with Wing Nut and Rubber Seal Pipe Stopper

4" Drain Stopper with Blanking Cap for Reliable Pipe Testing

Looking for a dependable way to close off a pipe during pressure or leak checks? This 4" x 1/2" Drain Stopper (c/w Blanking Cap) is a mechanical drain plug built for plumbers, contractors and maintenance teams who need fast, repeatable results on site. It works as a drain test plug and a pipe testing plug, giving you a secure closure so you can fill, pressurise and inspect a line with confidence.

The stopper features a thick rubber seal fitted around a strong outer steel collar. When you tighten the central wing nut, the rubber expands outward and presses firmly against the inner pipe wall. This creates a watertight seal that holds under test conditions, helping you find leaks early and avoid costly rework. The zinc plated steel finish resists corrosion, while the brass adjustment nut turns smoothly even after repeated use. The included blanking cap adds extra protection and a neat finish to the assembly.

Because it is easy to install and remove, this drainage pipe stopper saves time on every job. No special tools are needed, and the handle design gives you a firm grip for quick fitting.

Key Features

• Thick rubber seal on outer steel collar for a tight, secure fit
• Size: 4" x 1/2" suits standard drainage pipework
• Supplied complete with blanking cap
• Zinc plated steel body resists rust and wear
• Brass wing nut for smooth, easy tightening
• Reusable design for repeated testing

Ideal For

• Drainage and sewer pipe testing
• Plumbing installations and repairs
• Building and construction sites
• Maintenance and inspection work

Seal it, test it and get the job done right with a drain stopper you can trust.