This kit contains around 30cm of quality, flexible 6mm air line suitable for automotive use - and 2x 4mm to 4mm couplers so that you can simply splice in this section of cable - or extend a hose which is not long enough.
eBay
Natalink 10PCS Keystone Jack Rj45 Coupler Inline Coupler for Cat7/CAT6A/CAT6/CAT5E Female to Female Insert Coupler
Aliexpress UK
Air line quick release coupler with 1/4 BSP male thread. • Thread size – 1/4 BSP male thread.
eBay
ZOERAX CAT7 CAT6A CAT6 Coupler RJ45 Keystone Shielded Coupler, Shielded Female to Female RJ45 Inline Coupler Keystone Jack
Aliexpress UK
Available in 1/2" BSP - M22 - M16 Threads. C Coupling locks, Keyed Differently. Dummy Couplings to be fastened to the trailer to connect your Air Lines to when not in use. Item; High Quality British Made Air Brake Couplings.
eBay
Cat 8 Ethernet Coupler, Shielded RJ45 Coupler PoE Cable Extender for Cat7/Cat6a/Cat6/Cat5e Network Cable, RJ45 Inline Coupler
Aliexpress UK
Includes 2pcs 12.8mm hex female fittings and 2pcs 12.8mm male fittings. Function: Designed for quick and easy connection or disconnection of air tools and airlines. Suitable for use with pneumatic tools, spray guns, tyre inflators, air blow guns, airbrush compressors, air compressors, and hose reels.
eBay
1pc F Type RF Female Jack to RJ45 Male Plug Ethernet Coaxial Barrel Coupler Converter Coax Adapter Connector for Line Tester
Aliexpress UK
Genuine PCL Airflow Air Line Couplings & Adaptors. This product, along with the Standard Adaptor, is still manufactured in the UK to the highest possible standards, with the "Made in Sheffield" Airflow series now a benchmark in the UK for quality and reliability.
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HPA AIR CO2 Gas Quick Disconnect Plug QC02 1/8NPT 1/8BSP M10 G1/8" Fill Nipple Male Female Adapter Adaptor 8mm Coupler,3/8-24UNF
Aliexpress UK
Q: Can I buy a single item?. Q: Are these compatible with PCL tails?. High-quality plated steel construction, suitable for fast tool changes and secure airline connections. Industrial manifolds & airline distribution.
eBay
1/8NPT 1/8BSPP M10x1 Thread Air Refilling Stainless Steel Quick Coupler 8MM Male Plug Adapter Fittings 2pc/set
Aliexpress UK
1x Twin PCL standard coupling. Genuine PCL couplings. For use with compressed air.
eBay
Quick Coupler 8MM Male Plug Adapter Fittings 1/8NPT 1/8BSPP M10x1 Thread Air Refilling Stainless Steel 3pc/set
Aliexpress UK
1 x 1/4" BSP Female Air Line Splitter. 2 x 1/4" BSP Male Air Coupling. 1/4" BSP compatible. 1 x 1/4" BSP Male Air Fitting.
eBay
USB C Male to Male Adapter, USB Type C Coupler Extender Support PD, 5Gbps, for Thunderbolt 4/3, MacBook Pro/Air, Laptop, Phones
Aliexpress UK