This is particularly useful when using the 9.5mm duotight thermowell tee to provide a rigid join. 

Specifications:

Approx 6.5mm ID

9.5mm tubing with duotight compatible scoring

60mm long

Although it's possible to make joins using short pieces of 9.5mm OD Evabarrier, we would very much recommend to go a rigid join when going to a larger diameter hosing.