My T-Junction Doesn’t Fit My 15mm Copper Pipe - What Can I Do?

If you've just bought a bidet attachment and are excited to install it—only to find that the T-junction piece doesn’t fit your 15mm copper pipe then don’t worry. Although uncommon in UK homes, it can be easily resolved with a simple, inexpensive fix.

Why Doesn’t the T-Junction Fit?

Most bidet attachments, including those sold by Real Bidets, come with a ½ inch BSP (British Standard Pipe) T-adapter. This is standard for flexible hoses connected to toilet cisterns. However, some UK homes use 15mm rigid copper inlet pipes, especially in older plumbing systems. These copper pipes aren't directly compatible with the standard T-piece without an adapter.

What’s the Solution?

Fortunately, you don’t need to return your bidet or hire a plumber. The fix is simple: buy a 15mm compression fitting adapter. These fittings are very cheap (typically under £5) and available both online and in store at hardware retailers like B&Q and Screwfix.

✅ What You’ll Need:

• 15mm compression T-fitting or a 15mm to ½ inch BSP adapter
• PTFE tape (to ensure leak-free connections)
• Basic tools (like a spanner or wrench)

Step-by-Step: How to Adapt Your Pipe

1. Turn off your toilet's water supply.
2. Loosen the copper inlet pipe to expose the connection.
3. Install the 15mm compression fitting with PTFE tape.
4. Attach the provided ½ inch bidet T-junction to the adapter.
5. Reconnect everything and test for leaks.

💡 Tip: PTFE tape on threaded joints helps ensure a watertight seal.

Still Unsure? We're Here to Help

While we don’t sell compression fittings ourselves, the Real Bidets team is always happy to guide you through the process or answer installation questions. We’re available 24/7 via our website chat or through our contact form.

In Summary

If your bidet T-piece doesn’t fit a 15mm copper pipe, don’t stress. Just grab a cheap compression fitting from your local B&Q or Screwfix and you’ll be set. It’s a small fix with a big impact on comfort and hygiene.