If the engagement is not secure enough, simply twist the collar by a further turn.
Please ensure the valve head is parallel with the valve and pressed all the way down when inserted.
If the collar cannot be pushed down properly please pull it back and twist it counterclockwise before further attempts.
Please refrain from lubrication attempts.
The Push & Twist head is compatible with Presta and Schrader valves under the same steps.
For step-by-step instructions, please visit the link below: