its prety cold here now so i guess in order to pump with cold you have just open your windows
jk .by the way with water pumping the stretch and the instensity in the tube is far stronger.in order to have the same expansion with waterpump in 20 minutes i need almost one hour in airpump which is 3-4 sets of 10-20 minutes.and i apply mutliply techinigues in there.like stadily 5hg pressure go up to 10 for a few seconds to create a better strech aand expansion then go down to 4,thats actually the techique the dp4000 use.i also do some tube milking and i keep in mind every 5 minutes aproximately low the pressure in 2hg for 30sec to 1 min.so yeah maybe airpumping is more complicated by i am prety sure i feel my penis more strechable and not softhard as i was feeling with the
bathmate