Plumbright Drain Off Cock Type B - 15mm - Z09017
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Product Information
Full details
The Plumbright Type B Drain Off Cock is an essential plumbing component designed for professional plumbers and DIY enthusiasts working with 15mm copper or plastic pipework in domestic heating systems. Its primary benefit is providing a reliable, controlled point to drain a single radiator or specific heating loop during maintenance or replacement tasks, preventing messy water spills. A key caveat to keep in mind is that proper installation requires isolation of the water supply and draining the system segment to ensure a leak-free fit.
All features
| Model Part Number | Z09017 |
|---|---|
| Brand | Plumbright |
Extended Product Information
FAQs
Can this be used on both copper and plastic pipes?
Yes, it is designed for standard 15mm pipework; however, ensure you use the appropriate inserts if you are installing on plastic (PEX) pipe.
Does this valve require any sealant?
While the internal seals are designed for a tight fit, using a small amount of PTFE tape on the threads can provide extra insurance against leaks.
Where is the best place to install this?
It should be placed at the lowest point of the radiator circuit you intend to drain to ensure complete evacuation of water.
Is this product suitable for drinking water?
No, this is intended specifically for central heating systems and should not be used in potable water lines.
What tools do I need for installation?
You will typically need a pipe cutter, a deburring tool, and a set of adjustable spanners to secure the compression fittings.
Troubleshooting
The drain off valve is leaking from the nut
Ensure the fitting is properly tightened and the pipe ends are cut square and deburred.
Water continues to trickle out slowly after closing
Debris may be caught in the internal seat; briefly open and close the valve to flush out any trapped particles.
Pros and Cons
Pros
- Simple and straightforward installation process
- Ideal for targeted drainage without emptying the entire system
- Robust construction for long-term reliability
- Standardized size fits most residential plumbing systems
Cons
- Requires system drainage prior to installation
- Soldering or compression tools may be required depending on pipe type
- Not suitable for use on high-pressure mains water lines
Setup, Compatibility & Care
To install, first turn off the heating system and allow the radiators to cool. Use a pipe cutter to remove a section of the 15mm pipe at the lowest accessible point of the heating loop. Ensure the cut is clean and free of burrs to prevent damage to the cock's seals. If using a compression-style model, tighten the nuts firmly with a wrench, taking care not to overtighten and crack the fitting. For maintenance, periodically check the drain off valve for any signs of weeping or corrosion. It is advisable to keep a dust cap over the outlet to prevent debris from blocking the valve mechanism.