
This tubing is marked 6.5mm x 10mm. It actually measures a bit over 6.5mm ID. This tubing will work with true 1/4" barb connectors, but be careful. I purchased some 1/4" barbs that are actually 6mm. This oversized tubing will not even clamp down to the undersized barbs. I wish the actual size was listed on these items.

Quickun Industrial Grade Plastic PVC Vinyl Tubing, 5/16" ID X 3/8" OD Clear Tube BPA Free Heavy Duty, 10FT
16 Review

Goodyear Ultra Grip Ice 2 205/50 R17 93T winter
128 Review

GeilSpace 6 Pack Of 3/4" Γ 8" Black Metal Pipes - Ideal For DIY Industrial Shelving - Fits Standard 3/4" Black Threaded Pipes And Fittings - Vintage Industrial Steel Pipe (Black)
11 Review

π§ DeWalt DXCM024 0344 Dual-Layer Premium Rubber
10 Review

High-Quality QiiMii Stainless Steel Sanitary Clamp With Silicone Gasket - 2 Inch, Single Pin Tri Clover Design
16 Review

6 Pack Miahart Adjustable 304 Stainless Steel 4 Inch Hose Clamp Duct 91Mm-114Mm Worm Gear Pipe Clamp For Automotive, Mechanical Agriculture.
18 Review

1 Inch Beduan Brass Electric Solenoid Valve, 12V Normally Closed Air Valve For Water, Gas, Fuel, And Oil
10 Review

Joywayus 5/8" ID Hose Barb Hex Union Brass Fitting Water/Fuel/Air With 10 Stainless Steel Clamps (Pack Of 5)
13 Review