1 - To make a good repair, first immerse the valve in hot water for a few minutes to take it off.
2 - Remove the valve by pulling gently ; otherwise cut gently around to remove it.
3 - Always very important, the repair must always be clean, it is necessary to clean the hole with an alcohol patch before you can stick the valve.
4 - Then to have a perfect repair, glue the adhesive valve ensuring that the flange is flat, so as not to bend the plastic and make air out around the valve.
Inflate your bladder to the right pressure to check your repair is not leaking.