For 1/2" BSP fittings, the pipe outer diameter is approximately 20.9 mm (≈13/16"). BSP nominal size does not equal the actual pipe OD — it is a trade size. Measure your existing pipe OD or count the threads per inch (1/2" BSP = 14 TPI) to confirm compatibility. If you are converting from inches, 1/2" BSP is generally equivalent to DN15 in metric plumbing systems.

Brass BSP fittings of this type are typically rated for working pressures up to 200 PSI (≈14 bar) in water and general fluid applications. Actual performance depends on installation quality, operating temperature, and the media being conveyed. Contact us to confirm if your application requires a specific pressure certification.

Yes. Brass is naturally corrosion-resistant and generally suitable for outdoor, damp, and humid environments. For best results in outdoor plumbing or irrigation applications, apply PTFE tape or a compatible thread sealant to ensure a watertight seal. For highly corrosive or saltwater environments, consult us before use.

No. BSP and NPT (National Pipe Thread) are not directly compatible. They differ in thread angle (55° for BSP vs. 60° for NPT) and pitch. If your existing plumbing uses NPT threads, you will need a BSP-to-NPT adapter. When in doubt, count the threads per inch on your existing fitting — 1/2" NPT has 14 TPI as well, but the thread form is different, so physical gauging or a thread gauge is the most reliable method.

Choose a 90° elbow when you need to change pipe direction around a corner or obstacle. Choose a tee when you need to branch a single line into two directions (e.g., splitting a water supply). Choose a union coupler (straight) when joining two pipe ends in a straight run — the union design allows the joint to be broken and remade without cutting the pipe, which is useful for maintenance access points.

Male BSP (MBSP) fittings have external threads that screw into a female-threaded port, valve, or fitting. Female BSP (FBSP) fittings have internal threads that accept a male-threaded pipe or fitting. The execution options on this listing (e.g., "Male & Female #1", "Female & Female #3", "Elbow Female & Male #9") describe the thread gender on each end of the fitting — the first gender listed is typically the inlet end.

In most cases, yes. BSP parallel threads (BSPP) require PTFE tape or a liquid thread sealant to achieve a leak-free seal, as the thread form alone does not create a pressure-tight joint. BSP tapered threads (BSPT) can self-seal under pressure but applying sealant is still best practice. Wrap PTFE tape clockwise (when viewed from the male thread end) for 2–3 turns before assembly.