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Description
Precision Pneumatics — UK Stock
8mm Stem to 4mm Tube
Brass Air Line Reducer
A compact, precision-machined brass fitting engineered to transition an 8mm stem connection to 4mm OD pneumatic tubing — delivering a secure, leak-proof air seal in demanding workshop and industrial environments. Rated to 16 Bar (232 PSI). No tools required for tube insertion.
Key Features
Push-Fit Tube Entry
Insert 4mm OD tubing by hand — no spanners, no thread tape. Collet grips and seals instantly.
Precision Brass Body
CNC-machined brass with nickel plating resists corrosion, moisture, and compressor oil contamination.
NBR Leak-Proof Seal
Nitrile rubber (NBR) O-ring maintains an airtight seal across the full operating pressure range.
Compact Form Factor
Minimal footprint fits tight manifold assemblies, panel-mount installations, and confined machine bays.
Wide Temperature Range
Rated −20°C to +80°C — reliable in cold stores, heated press shops, and outdoor compressor stations.
Universal Compatibility
Mates with standard 8mm stem fittings across major pneumatic brands — no adapters required.
Typical Applications
Workshop compressed air lines
Pneumatic machinery & actuators
Air compressor installations
Industrial automation systems
Garage & tyre inflation equipment
Manufacturing & production lines
Air line repairs & extensions
Pneumatic maintenance & retrofits
Technical Specifications
| Specification | Detail |
|---|---|
| Product Type | Pneumatic Stem to Tube Reducer |
| Stem Diameter | 8mm |
| Tube Outside Diameter (OD) | 4mm |
| Body Material | Nickel-Plated Brass |
| Seal Material | NBR (Nitrile Rubber) |
| Maximum Working Pressure | 16 Bar (232 PSI) |
| Operating Temperature | −20°C to +80°C |
| Connection Type | Push-Fit (Tool-Free) |
| Corrosion Resistant | Yes |
| Media | Compressed Air & Inert Gases |
| SKU | air_comp833 |
| Barcode (EAN) | AC015014875116099 |
Package Contents
1 × 8mm Stem to 4mm Tube Brass Air Line Reducer
Why Air Compressors UK
UK-Held Stock
No overseas delays. Dispatched from our UK warehouse.
Same-Day Dispatch
Order before 2pm Monday–Friday for same-day despatch.
Trade & Wholesale
Volume pricing available. Contact us for trade account terms.
Expert Support
Pneumatic specialists on hand to advise on compatibility and system design.
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.