Based on Govt guidance, we are continuing to operate remotely, providing support via email and telephone. Orders are being fulfilled as normal with the exception of out of stock items which understandably have a longer lead time. Please bear in mind that there may be delays with courier services. You can report bugs or provide general feedback on this site here.
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:
Dimentions for the insert: