This adapter will allow you to connect your Schrader style bicycle or tire pump to your paddleboard for easy inflation. I am using it with a Milwaukee M18 Electric portable air pump to fill up my paddleboard on the go.

I printed in PETG, but I suspect if you print in TPU it will work better and be more durable, I didn't have any on me to test with. Use supports, there's no way around it.

WARNING: If you print in PETG, be very careful not to snap the stem off in the schrader assembly. Trying to pick PETG out of the fill hose is a very unfun time.