My ILTET bottle is leaking, how to remedy?

It is probably about a tightening problem. We recommend to hardly tighten the ring then to loose it very slightly (by 1/8th or 1/10th of tour) until the air penetrates and avoid the teat to fold over.  

Some time (and some training) is required to acquire “the knack”. If you continue experiencing difficulties, don’t hesitate to contact us.