Reducing Bushes
Galvanised BSP reducing bushes for stepping larger threaded connections down to smaller sizes in compressed-air, water and general industrial pipework.
Galvanised Malleable Iron
Male BSP → Female BSP
Compressed Air Pipework
Workshop & Industrial Use
Priced Online
Reduce BSP Thread Sizes Cleanly
A reducing bush screws into a larger female BSP connection and provides a smaller female BSP outlet. It is a compact way to adapt valves, pipework, manifolds and other threaded components without adding unnecessary length.
Corrected wording: thread sizes on this page use proper quotation marks such as 1/2" and 3/8" — not malformed text such as and quot;.
Search by Size or SKU
Shop Tanair Galvanised Reducing Bushes
Galvanised BSP Reducing Bush
Tanair 14-18RB | 1/4″ – 1/8″ BSP Galvanized Reducing Bush
Reduction1/4″ → 1/8″
SKU14-18RB
Thread TypeMale → Female BSP
FinishHot-Dip Galvanised
£1.77 ex VAT
£2.12 inc VAT
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Galvanised BSP Reducing Bush
Tanair 34-14rb | 3/4″ – 1/4″ BSP Galvanized Reducing Bush
Reduction3/4″ → 1/4″
SKU34-14rb
Thread TypeMale → Female BSP
FinishHot-Dip Galvanised
£2.04 ex VAT
£2.45 inc VAT
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Galvanised BSP Reducing Bush
Tanair 34-38rb | 3/4″ – 3/8″ BSP Galvanized Reducing Bush
Reduction3/4″ → 3/8″
SKU34-38rb
Thread TypeMale → Female BSP
FinishHot-Dip Galvanised
£2.04 ex VAT
£2.45 inc VAT
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Galvanised BSP Reducing Bush
Tanair 34-12rb | 3/4″ – 1/2″ BSP Galvanized Reducing Bush
Reduction3/4″ → 1/2″
SKU34-12rb
Thread TypeMale → Female BSP
FinishHot-Dip Galvanised
£3.97 ex VAT
£4.76 inc VAT
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Galvanised BSP Reducing Bush
Tanair 1-34rb | 1″ – 3/4″ BSP Galvanized Reducing Bush
Reduction1″ → 3/4″
SKU1-34rb
Thread TypeMale → Female BSP
FinishHot-Dip Galvanised
£3.51 ex VAT
£4.21 inc VAT
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Galvanised BSP Reducing Bush
Tanair 114-1rb | 1 1/4″ – 1″ BSP Galvanized Reducing Bush
Reduction1 1/4″ → 1″
SKU114-1rb
Thread TypeMale → Female BSP
FinishHot-Dip Galvanised
£8.29 ex VAT
£9.95 inc VAT
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Galvanised BSP Reducing Bush
Tanair 112-114GRB | 1 1/2″ – 1 1/4″ BSP Galvanized Reducing Bush
Reduction1 1/2″ → 1 1/4″
SKU112-114GRB
Thread TypeMale → Female BSP
FinishHot-Dip Galvanised
£5.10 ex VAT
£6.12 inc VAT
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Product imagery: the cards above use image URLs taken directly from the Tanair catalogue/archive rather than invented media filenames.
How a Reducing Bush Works
Larger Male Thread Outside
The external male BSP thread fits into the larger female threaded connection in the pipework, valve or fitting.
Smaller Female Thread Inside
The internal BSP thread accepts the smaller male fitting or component, creating a compact step-down connection.
What to Check Before Ordering
Both BSP SizesIdentify the larger connection and the smaller connection you need to create.
Thread GenderReducing bushes are normally male on the outside and female on the inside.
System PressureConfirm that the fitting and the rest of the installation are suitable for the operating pressure.
Pipe BoreAvoid unnecessary restrictions on high-flow compressed-air lines.
Thread SealUse a suitable thread-sealing method for the application and install correctly.
ApplicationThe current galvanised range is used across compressed air and other compatible non-aggressive services.
Reducing Bush vs Reducing Nipple vs Reducing Socket
Reducing Bush
Male outside, female inside. Best where you want a compact reduction directly inside an existing female connection.
Reducing Nipple
Male threads on both ends. Used to join two female connections of different sizes.
Reducing Socket
Female threads on both ends. Used to join two male threaded components of different sizes.
Choose by the Existing Connections
The correct fitting type depends on the thread size and gender already present at both ends of the joint.
Reducing Bush FAQs
What is a BSP reducing bush?
It is a threaded fitting with a larger male BSP thread on the outside and a smaller female BSP thread inside, used to reduce one threaded connection size to another.
Can reducing bushes be used on compressed-air pipework?
Yes, provided the fitting material, thread specification and pressure rating are suitable for the compressed-air system.
How do I read a size such as 3/4" – 1/2"?
The first size is the larger outside male BSP thread. The second size is the smaller internal female BSP thread.
Should I choose a reducing bush by outside diameter?
No. BSP nominal sizes do not directly equal the measured outside diameter. Identify the actual BSP thread size or use a reliable BSP sizing guide.
Are prices shown ex VAT and inc VAT?
Yes. Product cards show both values for convenience.
Not Sure Which Reducing Bush You Need?
Tell us the existing BSP connection size and the size you need to reduce it to, or send a clear photo and measurements.
Industries We Support
Energy, Process & Heavy Industry Food & Beverage Automotive & Transport Manufacturing & Engineering
And many more — talk to us for help sizing the right solution for your application.
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