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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