what does the "OD" stand for?

"OD" stands for Outside Diameter of the tubing.

Can this be used for water filtration system?

Yes. I've seen them used on those systems.

Can this be used for fuel lines ?

No, this is specifically used for computer cooling. Fuel requires a different types of material that you can find at an auto parts store.

Can these be used for 3/8 to 1/4 inch tubing reduction?

You really need to match standard or metric.

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Yoebor Pneumatic Push to Connect Reducer Union Coupler 8mm x 4mm OD 10pcs

Yoebor Pneumatic Push to Connect Reducer Union Coupler 8mm x 4mm OD 10pcs

Product ID: 78636550

Details

Brand
Yoebor
Color
Metric Tube
Connector Type
Union
Exterior Finish
Brass
Item dimensions L x W x H
1.34 x 0.6 x
Manufacturer
Metalwork

💨150 psi working pressure

🔥Heat & impact resistant PBT

🔧Push-to-connect ease

¥2665

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔗 Connect smarter, not harder — the ultimate reducer for seamless flow!

DURABLE PBT POLYMER BUILD - Crafted from polybutylene terephthalate for superior resistance to solvents, heat (32-140°F), shrinkage, and impact—built to last.
HIGH PRESSURE PERFORMANCE - Rated for up to 150 psi, ensuring reliable operation in demanding pneumatic and fluid systems.
VERSATILE DIAMETER REDUCER - Seamlessly connects 8mm to 4mm pipes, perfect for adapting different tubing sizes without compromising flow.
BULK PACK FOR PRO EFFICIENCY - Includes 10 couplers per set—ideal for professionals who value readiness and consistent quality on every project.
TOOL FREE INSTANT CONNECTION - Push-to-connect design eliminates the need for tools or sealants, saving you time and hassle on every install.

The Yoebor Pneumatic Push to Connect Reducer Union Coupler (8mm x 4mm, 10pcs) is a high-performance plumbing fitting made from durable PBT polymer. Designed for quick, tool-free installation, it connects pipes of different diameters with a secure push-to-connect mechanism. Rated for pressures up to 150 psi and operating temperatures from 32 to 140°F, this coupler offers reliable resistance to solvents, heat, shrinkage, and impact—making it a trusted choice for professional pneumatic and fluid systems.

Specifications

ASIN	B07CG7GQBK
Best Sellers Rank	#30,936 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #93 in Push-to-Connect Fittings
Brand Name	Yoebor
Color	Metric Tube
Connector Type	Union
Customer Reviews	4.7 4.7 out of 5 stars (161)
Exterior Finish	Brass
Item Dimensions	1.34 x 0.6 x 0.6 inches
Manufacturer	Metalwork
Material Type	Plastic
Number of Pieces	10
Set Name	Yoebor Pneumatic Push to Connect Reducer Union Coupler 8mm x 4mm OD 10pcs
Size	8mm x 4mm
Thread Type	NPT
Unit Count	10 Count

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TrustScore 4.5 | 7,300+ reviews

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The product quality is outstanding. Exactly what I needed for my work.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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