BSP Male to Female Reducing Bush Stainless Steel Pipe Fitting Adapter

Select the F (Female) size to match your existing port — this is the thread that screws into your manifold, valve, or pipe body. Then select the M (Male) size to match the smaller pipe or fitting you are connecting. For example, if your pump has a 1/2" BSP port and you need to connect a 1/4" instrument line, choose F1/2" × M1/4". If you are unsure of your port size, use a thread pitch gauge or caliper to measure the thread diameter and pitch before ordering.

Stainless steel BSP reducing bushes are generally rated for working pressures up to approximately 150 PSI (≈10 bar) in standard water and air plumbing applications. Actual pressure capacity depends on the specific size, wall thickness, and the nature of the media. For high-pressure hydraulic circuits or steam lines, please contact us to confirm suitability for your application.

Yes. Stainless steel provides strong resistance to rust, oxidation, and many corrosive substances, making these BSP reducing bush fittings well-suited for outdoor plumbing installations, marine environments, food-processing adjacent systems, and industrial settings where carbon steel fittings would corrode prematurely. For highly aggressive chemicals or saltwater immersion, contact us to confirm material compatibility.

These fittings use BSP (British Standard Pipe) threads, which are common in the UK, Europe, Australia, and Asia. BSP threads have a 55° thread angle and are not directly interchangeable with NPT (National Pipe Taper) threads, which have a 60° angle and are standard in North America. Mixing BSP and NPT threads without a proper conversion adapter will typically result in cross-threading or leaks. Always verify your system's thread standard before purchasing.

Stainless steel BSP reducing bushes are generally suitable for compressed air distribution systems when properly sealed with PTFE tape or an approved thread sealant. For natural gas or LPG lines, always verify compliance with local building codes and consult a licensed gas fitter — regulations vary by jurisdiction and not all fittings are approved for gas service without specific certification.

Yes, thread sealant is typically required. For BSPP (parallel) threads, the threads do not seal on their own — apply PTFE tape (2–3 wraps on the male thread) or a liquid thread compound before assembly. For BSPT (tapered) threads, the taper provides some mechanical seal, but sealant is still recommended for most pressure applications. Always apply sealant to the male threads, not the female port, and avoid over-tightening, which can crack the fitting body.

A reducing bush (also called a reducer bushing or hex bush) has male threads on the outside and female threads on the inside. It screws into an existing female port and provides a smaller female outlet — ideal for stepping down a port in a valve body, manifold, or pump. A reducing coupling has female threads on both ends and joins two male pipe ends of different sizes. Choose a reducing bush when you need to adapt a port; choose a coupling when you need to join two pipe ends.