BSP Female Pipe Fittings Reducer Adapter, 304 Stainless Steel, 3/8" to 2"

The size format is Outer Port × Inner Port — for example, 1" × 1/2" means the larger female port accepts a 1-inch BSP male thread and the smaller port accepts a 1/2-inch BSP male thread. Measure your existing pipe threads with a thread gauge or caliper, then select the variant that bridges your two pipe diameters. As a quick reference: 1/4" BSP ≈ 13.2mm OD, 3/8" ≈ 16.7mm, 1/2" ≈ 20.9mm, 3/4" ≈ 26.4mm, 1" ≈ 33.2mm, 1-1/4" ≈ 41.9mm, 1-1/2" ≈ 47.8mm, 2" ≈ 59.6mm (all measured on the male thread OD).

304 stainless steel BSP fittings are generally rated for working pressures up to 150 PSI (approximately 10 bar) in standard plumbing and fluid-transfer applications. Actual ratings depend on pipe wall thickness, thread engagement, and sealant used. For high-pressure systems, please contact us to confirm suitability before ordering.

Yes. 304 stainless steel offers strong resistance to rust, oxidation, and mild chemical exposure, making these adapters well-suited for outdoor plumbing, irrigation systems, and humid environments. For highly corrosive or marine applications where chloride exposure is high, 316 stainless steel is typically recommended instead.

These fittings use BSP (British Standard Pipe) threads, also known as G-thread or Whitworth pipe thread. BSP is widely used in plumbing, pneumatics, and hydraulics across the US, UK, Europe, and Asia. BSP is NOT directly compatible with NPT (National Pipe Taper) threads — the thread angle and pitch differ. Always verify your existing fittings are BSP before ordering.

Yes. BSP parallel (BSPP) threads rely on a face seal or thread sealant for a leak-free connection — the threads alone do not self-seal. We recommend wrapping 2–3 layers of PTFE (Teflon) tape clockwise around the male threads before assembly, or using a compatible thread sealant compound for pressurized or vibration-prone systems. Do not overtighten — hand-tight plus 1–2 turns with a wrench is generally sufficient.

These adapters are generally used for water, air, and fluid transfer applications. For gas line use, local codes and regulations vary by jurisdiction. Please consult a licensed plumber or gas fitter and confirm compliance with your local standards before installation. In most cases, gas-rated fittings require specific certifications.

The 2Pcs option is ideal for multi-point installations (e.g., two branch lines on the same manifold), or simply to keep a backup fitting on hand so a future repair doesn't require a second order and shipping wait. It also typically offers a lower per-unit cost compared to two separate 1Pcs purchases.