BSP Reducing Bush Stainless Steel Male x Female Pipe Adapter — 13 Sizes

The size format is Male OD × Female ID — for example, 1" × 1/2" means the male (outer) thread is 1 inch BSP and the female (inner) thread is 1/2 inch BSP. Measure your existing pipe threads or check your fitting spec sheet. BSP sizes refer to nominal bore, not actual thread diameter — a 1" BSP thread is typically about 33mm across the thread flanks. When in doubt, go one size up on the male end to ensure a secure fit.

Quick inch-to-mm reference: 1/2" ≈ 13mm nominal | 3/4" ≈ 19mm | 1" ≈ 25mm | 1-1/4" ≈ 32mm | 1-1/2" ≈ 38mm | 2" ≈ 51mm.

These fittings use BSP (British Standard Pipe) threads, which are widely used in plumbing, hydraulics, and pneumatic systems across the US, UK, Australia, and most of Asia. BSP is generally not compatible with NPT (National Pipe Taper) threads without a dedicated conversion adapter, as the thread angle and pitch differ. Confirm your system uses BSP before ordering.

Yes. Stainless steel is inherently corrosion-resistant and is generally suitable for outdoor, marine, and high-humidity environments. In most residential and light commercial plumbing applications, stainless steel BSP fittings will typically outlast brass or galvanized alternatives in damp conditions. For prolonged saltwater or aggressive chemical exposure, contact us to confirm the alloy grade before installation.

Stainless steel BSP reducing bushes typically handle working pressures in the range of 150–3,000 PSI depending on size and wall thickness — smaller sizes generally support higher pressure ratings. For high-pressure hydraulic or industrial applications, contact us to confirm the rated working pressure for your specific size before installation.

Yes. PTFE (Teflon) tape or a compatible thread sealant compound is recommended for all BSP parallel thread connections to ensure a leak-free seal. Apply 2–3 wraps of PTFE tape clockwise on the male threads before assembly. For higher-pressure or vibration-prone systems, a liquid thread sealant rated for your media (water, air, oil) is generally preferred over tape alone.

Stainless steel BSP fittings are commonly used in water, compressed air, oil, and hydraulic systems. For gas line applications, local codes and regulations vary by jurisdiction — please consult a licensed plumber or gas fitter and verify compliance with your local standards before installation. We do not certify these fittings for gas service.

The 1Pcs option includes a single reducing bush adapter of your chosen size. The 2Pcs option includes two identical adapters of the same size — useful for projects requiring matched pairs (e.g., both ends of a bypass loop) or to keep a spare on hand for maintenance. Both options ship the exact size you select.

Installation is straightforward: apply PTFE tape to the male threads, hand-thread the bush into the female port until snug, then tighten with an appropriately sized wrench on the hex body. Typically 1–2 turns past hand-tight is sufficient for a leak-free seal — avoid over-tightening, which can crack fittings or distort threads. No special tools are required beyond a standard pipe wrench or adjustable spanner.