For the 4mm OD, what size are the outer screw and nut?

The corresponding threads of each size are as follows: 4mm Tube OD(M12*1); 6mm Tube OD(M14*1); 8mm Tube OD(M16*1); 10mm Tube OD(M18*1); 12mm Tube OD(M22*1).

Is everything in this safe for use with beverage without imparting any taste?

Maybe not, It's not food grade.

Will the 10mm work with 3/8 OD tubing?

There is little difference between 3/8 "and 10mm. If the working pressure of the airline is not too high, it can generally be used normally. The internal sealing ring can catch the 3/8" tube OD hose. If the pressure is too high, leakage may occur.

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Beduan Pneumatic Plastic Bulkhead Union Fitting 6mm Tube OD x 6mm Tube OD Push to Connect Air Fitting (Pack of 5)

Beduan Pneumatic Plastic Bulkhead Union Fitting 6mm Tube OD x 6mm Tube OD Push to Connect Air Fitting (Pack of 5)

Product ID: 341903541

Details

Size
6mm Tube OD (5
Material
Brass
Brand
beduan
Colour
black silver
Connector Type
Tube Od
Thread Size
6 millimetre

🔄360° rotatable push-to-connect design

🔥High-temp resistant brass & plastic body

🔩6mm OD x 6mm OD precision fit

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Description

🔧 Snap, Seal, and Flow—Upgrade Your Pneumatics Game!

BUILT TO ENDURE - Brass body and stainless steel gripping ring withstand up to 290psi and 120°C for reliable performance under pressure.
SECURE SEAL TECHNOLOGY - Optimized D seal and nitrile O-rings ensure leak-proof connections in both static and dynamic conditions.
EFFORTLESS INSTALLATION - Push-to-connect design lets you snap tubes in place in seconds—no tools, no hassle.
VERSATILE COMPATIBILITY - Works seamlessly with PU, PA, PE, and PVC tubes for air, water, and vacuum applications.
SPACE SAVING BULKHEAD UNION - Compact form factor fits tight spaces while enabling easy tube rotation for flexible setups.

The Beduan Pneumatic Plastic Bulkhead Union Fitting is a pack of 5 precision-engineered push-to-connect fittings designed for 6mm OD tubes. Featuring a durable brass and plastic body with stainless steel gripping rings and nitrile seals, these fittings deliver leak-proof, high-pressure (up to 290psi) and high-temperature (up to 120°C) performance. Ideal for air, water, and vacuum systems, their 360° rotatable design and compact bulkhead style make installation quick, flexible, and space-efficient—perfect for professional-grade pneumatic setups.

Specifications

Size	6mm Tube OD (5 PCS)
Material	Brass
Brand	beduan
Colour	black, silver
Connector Type	Tube Od
Thread Size	6 millimetre
Exterior Finish	Brass
Thread Type	Push-to-Connect
Number of Pieces	5
Manufacturer	Beduan
UPC	796826124968
Country of Origin	USA
Model number	kl02510
Number of Memory Sticks	5
Item Weight	109 g
Package Dimensions	9.5 x 6.3 x 1.7 cm; 109 g
Item model number	kl02510
Are batteries included?	No

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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$114.42

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In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to British Virgin Islands.

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