Description
Overview:
The Steel Drain Test Plug - 4" (100mm) Outlet 1/2" is a heavy-duty mechanical plug for sealing and pressure-testing sections of drainage and plumbing pipework. Made from robust steel with a compressible rubber sealing ring, it expands inside the pipe to create a secure, watertight seal. It suits internal pipe diameters from 94mm to 110mm, with a minimum insertion depth of 37.5mm and an overall plug length of 83.3mm. The 1/2 inch (12.7mm) outlet port allows connection to a gauge, hose, or hand test pump for controlled testing. Rated to a maximum back pressure of 10 psi (approximately 0.69 bar / 69 kPa), it is suitable for testing uPVC, clay, and cast iron systems in residential and commercial settings.
Key Features:
- Durable steel construction with a compressible rubber seal for a tight, reliable hold
- Suits pipe internal diameters from 94mm to 110mm for broad compatibility
- 1/2 inch (12.7mm) outlet port for attaching hoses, gauges, or test pumps
- Handles a maximum back pressure of 10 psi (about 0.69 bar / 69 kPa) for safe testing
- Minimum insertion depth of 37.5mm helps positioning and sealing stability
- Total plug length of 83.3mm for use in tighter access locations
- Quick to tighten and release for efficient set-up and removal
- Reusable design suitable for repeated site and workshop use
- Suitable for common soil, waste, and drain runs in domestic and commercial installations
- Supports both water tests and low-pressure air checks when used with appropriate equipment
Typical Applications:
Temporary sealing and testing of soil stacks, foul and surface water drains, and branch lines. Useful for section isolation during repairs, leak detection, commissioning new pipework, or verifying joints before backfilling. Common on construction sites, refurbishment projects, and routine maintenance in facilities management, plumbing, and groundwork operations.
Also known as:
Pipe test plug, drain test stopper, test bung, expanding drain bung, mechanical test plug, drain sealing plug, plumbing test stopper, pipe bung, mechanical pipe plug, drain blanking plug.
Product Specifications
| L&S Part No. | 200 498 |
|---|---|
| Unit of Sale | 1 |
| Size | 4" (100mm) |
| Key Features | - Steel construction with compressible rubber seal for watertight hold - Fits pipe diameters from 94mm to 110mm - 1/2 inch outlet port for gauge or pump connection - Handles up to 10 psi back pressure - Minimum insertion depth of 37.5mm for stability |
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