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When a plumbing run changes diameter mid-line, most installers reach for a coupling plus a separate reducer — adding bulk, potential leak points, and extra labor. Whether you're a plumber retrofitting an older system, a DIYer building a compressed air manifold, or a facilities tech maintaining industrial pipework, a stainless steel threaded pipe reducer nipple solves the problem in one compact piece.
Each listing is for 1 piece of a male-to-male BSP reducer nipple machined from stainless steel. The size format is Inlet × Outlet — for example, 2" × 1" (≈50mm × 25mm) means a 2-inch male BSP inlet reducing to a 1-inch male BSP outlet. Available sizes range from 1-1/2" × 1/2" (≈38mm × 13mm) up to 4" × 3" (≈100mm × 75mm), covering the most common residential and light-industrial reduction steps.
Typical applications include residential water supply line transitions, compressed air distribution headers, irrigation manifold assemblies, and light industrial fluid transfer systems where a BSP male-to-male reducing connection is required in a single fitting.
| Product Type | Threaded Pipe Reducer Nipple |
|---|---|
| Thread Standard | BSP (British Standard Pipe) — Male on both ends |
| Material | Stainless Steel |
| Finish | Mill / natural stainless (no coating) |
| Size Range (Inlet × Outlet) | 1-1/2" × 1/2" up to 4" × 3" — see variant options |
| Approximate Metric Equivalents | ~38mm × 13mm up to ~100mm × 75mm |
| Thread Type | BSPT (tapered) — confirm with variant options |
| Working Pressure | Typically up to 150 PSI (~10 bar) — contact us to confirm for your application |
| Temperature Range | See variant options or contact us to confirm |
| Quantity per Order | 1 piece (1Pcs) |
| Compatible Systems | Water supply, compressed air, gas (verify local codes), irrigation |
| Not Compatible With | NPT threads (requires adapter) |
The size format is Inlet × Outlet (e.g., 2" × 1" means a 2-inch male inlet reducing to a 1-inch male outlet). Measure your existing pipe threads or check your fitting spec sheet. BSP thread sizes are typically measured by nominal bore, not the actual outer diameter of the thread. When in doubt, go one size up on the inlet side to maintain flow capacity.
Stainless steel BSP threaded nipples generally support working pressures up to 150 PSI (approximately 10 bar) in standard plumbing applications. Actual ratings depend on pipe schedule, temperature, and the media being conveyed. For high-pressure or steam applications, contact us to confirm suitability before ordering.
Yes. Stainless steel construction provides strong resistance to rust, oxidation, and many corrosive media. These fittings are generally suitable for outdoor plumbing, marine-adjacent environments, and chemical-adjacent applications. For highly aggressive chemicals or saltwater immersion, verify compatibility with your specific media before installation.
These reducer nipples use BSP (British Standard Pipe) male threads on both ends. BSP is widely used in plumbing, hydraulics, and pneumatics across the US, UK, Europe, and Asia. BSP and NPT (National Pipe Thread) threads are not interchangeable — mixing them will result in cross-threading or leaks. If your existing system uses NPT, you will need a BSP-to-NPT adapter.
Yes. For a leak-free connection, apply PTFE (Teflon) tape or a suitable pipe thread sealant compound to the male threads before assembly. Wrap the tape in the direction of the thread (clockwise when facing the end of the fitting) for 2–3 layers. This is standard practice for BSP threaded fittings in water, gas, and compressed air systems.
Stainless steel BSP fittings are commonly used in gas distribution systems. However, gas line installations must comply with local building codes and regulations. Always have gas line work inspected by a licensed professional. Contact us to confirm the specific size variant is rated for your gas application before installation.
A standard nipple has the same thread size on both ends. A reducer nipple (also called a reducing nipple) has two different thread sizes — a larger inlet and a smaller outlet — allowing you to connect pipes of different diameters in a single compact fitting, without needing a separate reducer coupling and full-size nipple.
Ships within 48 hours · Estimated delivery Jun 21 - Jun 26
US$40
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