BSP Male Thread Reducer Nipple — Brass Pipe Fitting Connector Adapter

The size listed is Larger Male Thread × Smaller Male Thread. Measure the outer diameter of both pipe ends you need to connect. For example, a 1½" × 1" reducer nipple (approximately 38mm × 25mm) connects a 1½" female BSP port to a 1" female BSP port. When in doubt, contact us before ordering — we are happy to help confirm the right size.

This fitting uses BSP (British Standard Pipe) threads, which are widely used in plumbing and industrial systems in the US, UK, Australia, and internationally. BSP and NPT (National Pipe Taper) threads are not directly interchangeable — they have different thread angles and pitch. A BSP-to-NPT adapter is required if your existing system uses NPT fittings.

Yes. Brass is naturally corrosion-resistant and generally performs well in outdoor, humid, and wet environments including garden irrigation and exterior water supply lines. For highly corrosive or saltwater environments, additional protective measures or a different alloy may be advisable.

Brass fittings are commonly used in low-pressure gas applications. However, always verify local building codes and consult a licensed plumber or gas technician before installing any fitting on a gas line. Use a thread sealant specifically rated for gas service — standard PTFE tape may not be sufficient for all gas applications.

Brass reducer nipples of this type typically handle working pressures in the range of 200–600 PSI, depending on the specific size and wall thickness. For critical or high-pressure applications, contact us to confirm the rated pressure for the exact size you need before purchasing.

Yes. BSP male threads generally require PTFE (Teflon) tape or a thread sealant compound to achieve a leak-free seal. Apply 2–3 wraps of tape in the direction of the thread (clockwise when facing the thread end) before installation. Hand-tighten first, then use a wrench for a final snug fit — avoid overtightening, which can crack fittings.

Yes. This brass reducer nipple connector adapter is compatible with copper, steel, and most standard pipe materials as long as the thread standard matches (BSP). In wet environments, avoid direct contact between brass and galvanized steel where possible to minimize galvanic corrosion risk over time.