3/8" BSP Air Line Fittings
Shop 3/8" BSP threaded fittings for compressed-air pipework, including galvanised unions, sockets, plugs, elbows, nipples, tees, reducing fittings and ball valves for workshop and industrial installations.
Build, Extend or Repair 3/8" Compressed Air Pipework
3/8" BSP fittings are a practical choice for threaded compressed-air connections where a compact pipe size is suitable for the required airflow. The range on this page includes fittings for straight connections, direction changes, branches, blanking-off points, isolation and transitions between different BSP sizes.
Galvanised fittings are especially useful for fixed workshop and industrial pipework because the zinc-coated finish offers a durable, corrosion-resistant surface for everyday compressed-air installations.
Building a New Run
Use sockets, unions, nipples, elbows and tees to create straight pipe runs, branches and changes of direction.
Adapting Pipe Sizes
Reducing bushes, reducing nipples and reducing sockets allow 3/8" BSP pipework to connect to larger or smaller threaded sizes.
Isolating or Closing Lines
Ball valves provide local isolation while plugs can be used to close unused threaded ports or branches.
Shop the Complete 3/8" BSP Fittings Range
Browse all 21 products currently listed in the 3/8" BSP category. Choose the fitting you need below to open its individual product page for the latest price, availability and technical information.
3/8" BSP Galvanized Union
Demountable threaded union for connecting sections of 3/8" BSP pipework.
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3/8" BSP Galvanized Socket
Female-to-female socket for joining compatible 3/8" BSP male threads.
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3/8" BSP Galvanized Plug
Threaded plug for closing an unused 3/8" BSP female port.
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3/8" BSP Galvanized M&F Elbow
Male-to-female 90-degree elbow for compact changes of direction.
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3/8" BSP Galvanized Hexagon Nipple
Male-to-male hexagon nipple for joining two female 3/8" BSP connections.
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3/8" - 1/4" BSP Galvanized Reducing Socket
Female reducing socket for transitioning between 3/8" and 1/4" BSP.
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1/2" - 3/8" BSP Galvanized Reducing Socket
Female reducing socket for connecting 1/2" and 3/8" BSP threads.
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3/8" BSP Galvanized Equal Tee
Equal tee for creating a 3/8" BSP branch in compressed-air pipework.
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3/8" BSP Galvanized Elbow
Female threaded 90-degree elbow for changing pipework direction.
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3/8" BSP Galvanized Cross Tee
Four-way cross fitting for additional 3/8" BSP branch connections.
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3/8" BSP Galvanized Barrel Nipple
Male threaded barrel nipple for joining compatible female BSP fittings.
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1" - 3/8" BSP Galvanized Reducing Bush
Reducing bush for adapting a 1" BSP connection down to 3/8" BSP.
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3/4" - 3/8" BSP Galvanized Reducing Bush
Reducing bush for adapting 3/4" BSP down to 3/8" BSP.
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3/8" BSP Standard Female x Female Lever Ball Valve - Red
Full-size female-to-female lever ball valve for local 3/8" BSP isolation.
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3/8" BSP Mini Male x Female Lever Ball Valve - Black
Compact male-to-female mini lever valve for local line isolation.
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3/4" - 3/8" Galvanized Reducing Nipple
Male threaded reducing nipple for transitioning from 3/4" to 3/8" BSP.
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1/2" - 3/8" BSP Galvanized Reducing Bush
Reducing bush for adapting a 1/2" BSP port to 3/8" BSP.
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1/2" - 3/8" Reducing Nipple
Male threaded reducer for connecting 1/2" and 3/8" BSP female ports.
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3/8" BSP Mini Female x Female Lever Ball Valve - Black
Compact female-to-female mini ball valve for 3/8" BSP isolation.
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3/8" - 1/4" BSP Galvanized Reducing Bush
Reducing bush for adapting a 3/8" BSP port to a 1/4" BSP connection.
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3/8" - 1/4" BSP Galvanized Reducing Nipple
Male reducing nipple for transitioning between 3/8" and 1/4" BSP.
View ProductProduct availability and pricing can change. Use each product link for the current WooCommerce price and stock status.
What You’ll Find in the 3/8" BSP Range
Choosing the Correct 3/8" BSP Fitting
1. Confirm the Thread Size
Check that the connection you are matching is genuinely 3/8" BSP. BSP refers to the thread standard and does not equal the physical outside diameter of the thread.
2. Check Male or Female Threads
Confirm whether each side of the connection needs a male or female thread before selecting sockets, nipples, elbows, bushes or valves.
3. Identify the Job the Fitting Must Do
Choose a straight connector for joining pipework, an elbow for a direction change, a tee or cross for a branch, a reducer for changing size, or a valve for isolation.
4. Consider Airflow and Pressure Drop
The fitting size should suit the airflow demand of the system. Pipework that is too small can increase pressure drop, particularly over long runs or where several high-demand air tools operate together.
5. Seal Threaded Joints Correctly
BSP threaded compressed-air connections should be installed correctly using a suitable thread sealant or PTFE tape where appropriate to help create a secure, leak-resistant joint.
6. Check the Wider System
If you are extending an existing airline, consider pipe size, compressor capacity, operating pressure, drainage, isolation points and future expansion before finalising the layout.
Where 3/8" BSP Air Line Fittings Are Commonly Used
Why Buy Air Line Fittings from Compressed Air Systems UK?
Compressed-Air Specialists
We support businesses with compressors, pipework, air treatment, fittings, spares and compressed-air system advice rather than supplying fittings in isolation.
UK-Based Technical Support
If you are unsure which size, reducer or fitting style is correct, our team can help you work through the connection before ordering.
Trade Counter Collection
Orders can be collected from our Birmingham trade counter at B33 0LG when collection is more convenient than delivery.
Free Delivery Over £250
Free UK delivery is available on qualifying orders over £250, making it easier to combine pipework, fittings, spares and other compressed-air equipment in one order.
Support Beyond the Fitting
Our team can also assist with compressed-air system servicing, installations, breakdown support and wider air-system requirements.
Need Several Components?
If you are building or modifying a complete airline, contact us before ordering and we can help check that the fittings and thread sizes work together.
Useful Compressed Air Support
3/8" BSP Air Line Fittings FAQs
What does 3/8" BSP mean?
3/8" BSP refers to a British Standard Pipe thread size. It describes the thread standard and nominal size rather than the measured outside diameter of the thread.
Can I connect 3/8" BSP pipework to another BSP size?
Yes. Reducing bushes, reducing nipples and reducing sockets can be used where the thread arrangement and sizes match the installation.
Do BSP threaded fittings need PTFE tape?
Threaded compressed-air joints normally require an appropriate sealing method. PTFE tape or a suitable thread sealant may be used depending on the fitting and installation requirements.
What is the difference between a socket and a nipple?
A socket generally provides female threads at both ends, while a nipple generally provides male threads for joining two female threaded components.
When should I use a union instead of a socket?
A union is useful where you may need to disconnect the joint later without rotating or dismantling a long section of pipework.
Is 3/8" BSP suitable for every compressed-air installation?
No. The correct pipe and fitting size depends on airflow, operating pressure, run length and acceptable pressure drop. Higher-demand installations may require larger bore pipework.
Can you help me identify an existing fitting?
Yes. Call 0121 753 3330 or contact our team with the fitting details and, where possible, a clear photograph of the existing connection.
Need Help Choosing a 3/8" BSP Fitting?
If you are unsure whether you need a union, socket, nipple, reducer, elbow, tee or valve, speak to our compressed-air team before ordering.
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