The couplings are designed to take 4mm OD tubing and the plastic ring is designed to be inserted into a 12mm hole at least 7mm deep.
Dimentions for the outer ring:
Outer diameter: 11.8mm
Overall diameter: 12.8mm
Inner diameter: 6.3mm
Thickness: 5mm
Dimentions for the insert:
Outer diameter: 10mm
Inner diameter: 4mm
Thickness of top lip: 1.5mm
Diameter of legs: 6mm
 
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