Response of the brand
Hello J'Moul.
First of all thank you very much for getting in touch and for your feedback. In guess the adaptor that you mention is the one to use either with Presta or Schrader valves, if it's the case it should be included.
Please, visit any of our Decathlon branches and we will exchange the item for a brand new one with all the parts.
Have a good week.
Pascual
Response of the brand
Hi Mark. Thank you for leaving a review. Please do take advantage of the 2 year guarantee that we offer with all Decathlon products to exchange the pump for a new one. If you are able to send any photos of the problem directly to me too that would be very much appreciated as part of our quality control checks.
MICHAEL, Road Cycling Leader, DECATHLON UK