Plumbright Brass Flanged Backnut - 1 1/2 - BFB112
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City Plumbing GBPlumbright Brass Flanged Backnut 1 1/2 Bfb112
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Product Information
Full details
The Plumbright Brass Flanged Backnut (1 1/2) is designed for professional plumbers and DIY enthusiasts who require a heavy-duty, reliable fastening solution for sink and waste pipe connections. Its primary benefit is the superior durability of brass over plastic alternatives, which prevents stripping and ensures a leak-free seal under pressure. The main caveat is that, due to the material's weight and rigidity, users must be careful not to overtighten the nut against delicate plastic threads, which could potentially cause cross-threading if not aligned correctly from the start.
All features
| Model Part Number | BFB112 |
|---|---|
| Brand | Plumbright |
Extended Product Information
FAQs
Is this nut compatible with plastic waste traps?
Yes, it is designed to fit standard 1 1/2 inch threaded pipework, whether the mating part is plastic or metal.
Do I need plumber's tape for this connection?
Generally, no. The seal is primarily created by the rubber or foam washer against the basin; plumber's tape is usually unnecessary and may hinder a proper seal.
Will this brass nut rust?
Brass is highly resistant to corrosion and will not rust like ferrous metals, though it may develop a light patina over many years.
Can I use this for both kitchen and bathroom sinks?
Yes, as long as the sink waste assembly uses the standard 1 1/2 inch thread size.
Should I use tools to tighten it?
Hand-tightening is often sufficient for a watertight seal, but a basin wrench can be used for the final quarter-turn if space is restricted.
Troubleshooting
Nut feels difficult to thread onto the pipe
Back the nut off completely and check for debris in the threads. Ensure the nut is perfectly square to the pipe tail before turning.
Leaking after installation
Verify that the rubber washer is correctly positioned between the basin and the waste unit flange. Ensure the nut is tightened sufficiently to compress the washer.
Nut is seized on an old pipe
Apply a small amount of penetrating lubricant to the threads and let it sit for 15 minutes before attempting to unscrew with a wrench.
Pros and Cons
Pros
- Superior long-term durability compared to plastic components
- High resistance to thread stripping during installation
- Ensures a robust, leak-resistant connection
- Standardized sizing for universal compatibility
Cons
- Heavier and more rigid than plastic versions
- Requires careful alignment to avoid cross-threading
- May require more manual torque to seat a washer properly
Setup, Compatibility & Care
To install, first ensure the rubber or foam sealing washer is properly seated between the flange of the waste unit and the basin. Slide the Plumbright Backnut onto the threaded tail from below. Hand-tighten the nut initially to ensure the threads are properly engaged; once it is snug, use a basin wrench or slip-joint pliers if necessary, taking care not to overtighten. This nut is compatible with all standard 1 1/2-inch plastic or brass waste pipe threads. For care, avoid using harsh chemical drain cleaners, as they can cause oxidation on brass over time. If the nut becomes stuck due to mineral buildup, apply a light penetrating oil or use a warm, damp cloth to remove surface residue.