Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"
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Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"

Brass BSP Female Thread Reducing Pipe Adapter Connector — 1-1/4" to 2"

HomeDIYer
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By HomeDIYer®

Price:
$9.51 USD
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In stock (500 units), ready to be shipped

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Description

 

Brass BSP Female Thread Reducing Pipe Adapter — Connect Different Pipe Sizes Without Leaks

When your plumbing, HVAC, or fluid system requires joining two pipes of different diameters, a mismatched connection can mean costly leaks, pressure loss, or system downtime. Whether you're a professional plumber, HVAC technician, or a hands-on homeowner tackling a pipe upgrade, having the right brass BSP female thread reducing adapter on hand makes the job clean and reliable.

Each piece is a solid brass female-to-female BSP reducing adapter connector, machined to accept two different BSP (British Standard Pipe / G-thread) parallel thread sizes. Available in multiple size combinations ranging from 1-1/4" × 1/2" up to 2" × 2" — covering the most common reducing configurations in residential and light commercial piping. The larger port is the inlet and the smaller port is the outlet, allowing you to step down pipe diameter in a single fitting.

Typical applications include reducing pipe runs in water supply lines, connecting differently sized valves or manifolds in HVAC systems, and adapting BSP-threaded pneumatic or hydraulic components. This brass BSP reducing connector is also widely used in irrigation systems, compressed air lines, and industrial fluid transfer setups where a reliable female thread pipe joiner is needed.

🔗 Thread Standard: BSP (British Standard Pipe) Parallel Thread — also known as G-thread or BSPP. Not directly compatible with NPT threads. Verify your existing fittings use BSP before ordering.
⚠️ Size Note: Variant dimensions (e.g., "1-1/2\" × 1\") indicate inlet thread size × outlet thread size. If you are unsure of your pipe's BSP size, measure the thread OD or use a thread gauge. Contact us to confirm before purchase.

✅ Key Features of These Brass BSP Female Thread Reducing Adapters

  • 🔩Solid Brass Construction — Machined from solid brass for durability, corrosion resistance, and reliable performance in water, air, and gas lines — a dependable choice for brass pipe fitting applications.
  • 📐Wide Size Range — Available in 12 size combinations from 1-1/4" × 1/2" to 2" × 2", covering the most common BSP reducing adapter configurations for residential and commercial plumbing.
  • 🔄Female-to-Female Thread Design — Both ports feature internal (female) BSP parallel threads, allowing direct connection to male-threaded pipes, valves, or fittings without additional couplings.
  • 💧Leak-Resistant Thread Profile — Precision-machined BSP threads provide consistent thread engagement. Use with PTFE tape for a secure, leak-free seal in pressurized water and air systems.
  • 🏗️Versatile Application Fit — Suitable for plumbing, HVAC, pneumatic, hydraulic, and irrigation systems where a female thread pipe joiner or reducing connector is required to step down pipe diameter.
  • ⚙️Straightforward Installation — No special tools required beyond a standard pipe wrench. Compatible with standard BSP fittings and valves, making replacement or system expansion fast and straightforward.

📐 Technical Specifications — Brass BSP Reducing Adapter Connector

Material Solid Brass
Thread Standard BSP (British Standard Pipe) Parallel — BSPP / G-thread
Connection Type Female × Female (both ports internal thread)
Fitting Function Reducing Adapter / Joiner Connector
Available Size Combinations (Inlet × Outlet) 1-1/4" × 1/4", 1-1/2" × 1-1/2", 2" × 2", 1-1/4" × 1/2", 1-1/4" × 3/4", 1-1/4" × 1", 1-1/2" × 1/2", 1-1/2" × 3/4", 1-1/2" × 1", 2" × 1-1/4", 1-1/2" × 1-1/4", 2" × 1-1/2"
Working Pressure See variant options — typically rated for standard plumbing pressures; contact us to confirm for high-pressure applications
Finish Natural brass (uncoated)
Quantity per Order 1 piece
Compatible Media Water, air, natural gas, propane, hydraulic fluid (verify for other media)
NPT Compatible No — BSP and NPT threads are not interchangeable
Country of Origin Contact us to confirm

❓ Frequently Asked Questions

How do I choose the right size reducing adapter for my pipe?

Measure the outer diameter of your existing pipe threads and match them to the BSP standard size. The first dimension in each variant (e.g., 1-1/2" × 1") refers to the larger inlet thread; the second is the smaller outlet. Generally, 1-1/4" BSP has an OD of approximately 41.9mm (≈1.65"), 1-1/2" BSP is approximately 47.8mm (≈1.88"), and 2" BSP is approximately 59.6mm (≈2.35"). When in doubt, use a thread gauge or contact us to confirm before ordering.

What thread standard does this adapter use — is it compatible with NPT?

This adapter uses BSP (British Standard Pipe) parallel threads, also known as G-thread or BSPP. BSP is widely used in plumbing, HVAC, pneumatic, and hydraulic systems across the US, UK, Europe, and Asia. It is not directly compatible with NPT (National Pipe Taper) threads — the thread angle and pitch differ. If your existing fittings are NPT, you will need a BSP-to-NPT adapter.

Can this brass adapter be used outdoors or in wet environments?

Brass generally offers good corrosion resistance for indoor plumbing and moderate outdoor use. For prolonged outdoor or marine exposure, we recommend applying PTFE thread tape and, if needed, a protective coating. In highly corrosive environments (e.g., saltwater or chemical exposure), stainless steel fittings may be more suitable. Contact us if you need guidance for your specific environment.

What is the pressure rating of this reducing adapter?

Brass BSP fittings of this type typically handle working pressures in the range of 150–600 PSI depending on size, wall thickness, and application. For exact pressure ratings in your specific system, please contact us to confirm before installation in high-pressure lines.

Is PTFE tape required for installation?

Yes, applying PTFE (Teflon) thread tape or pipe thread sealant is strongly recommended for all BSP parallel thread connections to ensure a leak-free seal. Wrap the male threads 2–3 times in the direction of the thread before assembly. Do not apply sealant to the female threads on this adapter.

What tools do I need to install this fitting?

A pipe wrench or adjustable wrench is typically sufficient. Avoid over-tightening, as brass can crack under excessive torque. Hand-tighten first, then use a wrench for an additional 1–2 turns. Do not use power tools for final tightening on brass fittings.

What fluids or media is this adapter compatible with?

Brass fittings are generally compatible with water, air, natural gas, propane, and many hydraulic fluids. They are not recommended for use with ammonia, acetylene, or highly acidic/alkaline fluids. Always verify compatibility with your specific media before installation in critical systems.

🛒 Select your type (inlet × outlet size) above, then add to cart — ships from our US warehouse.

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