Possibly a new way to pump?
The other night, I unscrewed the attachment for the male/female connector, and just inserted the tube directly in the hole making a decent but not perfect seal.
What this caused me to do is keep squeezing the hand pump to keep the pressure around 3-5.
My unit constantly is stretching, shrinking, expanding.
I almost relate this to variable workouts in the gym.
I get a great pump, also it is a great forearm workout!