# Rothenberger Drain Test Plug with Plastic Cap – 4in (100mm)

This durable steel drain test plug from Rothenberger is the essential tool for sealing or blocking off 4-inch drain pipes prior to air testing, and can be used as a temporary plug in drainage systems, such as in showers or bathtubs. A simple adjustment is made using the robust wing nut for fitting to pipework.

**Features**

-   Manufactured in steel
-   Protective plastic thread cap
-   Wing-nut on threaded shaft - allows easy adjustment for tightening and release
-   4 inch diameter (101.6 mm)
-   Robust design
-   Plug drains prior to air testing
-   Can be used as a temporary plug

## Details

- **Price:** 8.14 GBP
- **Vendor:** ROTHENBERGER UK LTD (R25A)
- **Type:** Accessories
- **Tags:** Accessories, Central Heating, Drain Test Plug, National, Plumbing & Heating

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 8.14 GBP | In stock |

## Images

- Round metal pipe test plug with wing nut and rubber seal for plumbing systems

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> Source: [Carvers Building Supplies](https://www.carvers.co.uk/products/rothenberger-drain-test-plug-c-w-plastic-cap-4-100mm-130091)
> Updated: 2026-06-05