BSP Stainless Steel Reducing Bush — Female Thread Pipe Fitting

The size format shown is Large Port × Small Port. For example, 3/4"–1/4" means the bush reduces a 3/4" BSP female port down to a 1/4" BSP male outlet. Measure your existing pipe or fitting thread diameter before ordering — a thread gauge or caliper typically helps confirm the size. If you are between sizes, always size up and use an additional reducer rather than forcing a mismatched thread.

These fittings use BSP (British Standard Pipe) threads, which are generally compatible with most plumbing systems that follow the BSP/BSPP standard. BSP threads are widely used in the UK, Australia, Asia, and many parts of Europe. They are not directly compatible with NPT (National Pipe Taper) threads — if your existing system uses NPT, you will need a BSP-to-NPT conversion adapter.

Yes. Stainless steel construction provides strong resistance to rust, oxidation, and moisture, making these bushes generally suitable for outdoor plumbing, marine-adjacent environments, and applications exposed to humidity or mild chemicals. For highly aggressive chemical media (strong acids, chlorinated solutions), confirm material compatibility with your specific application before installation.

Stainless steel BSP reducing bushes of this type typically handle working pressures ranging from approximately 150 PSI to 3,000 PSI depending on size — larger sizes generally carry lower pressure ratings due to greater wall stress. Please contact us to confirm the rated pressure for your specific size before use in high-pressure hydraulic or pneumatic systems.

Stainless steel BSP fittings are commonly used in gas distribution systems. However, local codes and regulations vary by jurisdiction. Always verify compliance with your local plumbing or gas codes, use a thread sealant rated for gas service (such as yellow PTFE tape), and have the installation inspected by a licensed professional where required.

Yes — thread sealant is recommended for a leak-free connection. BSP parallel threads (BSPP) rely on a face seal or sealant to prevent leaks, while BSP tapered threads (BSPT) use thread interference but still benefit from PTFE tape or thread compound. Apply sealant to the male thread before assembly, wrapping PTFE tape clockwise (when viewed from the thread end) for 2–3 turns.

A pipe wrench or adjustable wrench is typically sufficient for most sizes. For larger sizes (1" and above), a strap wrench helps avoid surface marring on the stainless finish. Always use two wrenches — one to hold the mating fitting body and one to tighten the bush — to avoid transmitting torque stress to the connected pipe or valve.