Originally Posted by
ItsJustMe
The downside is that it generally doesn't work below about 35 degrees F
I took the back off, flattened the diaphragm, flipped it around the other way and it works again now. But still not in the cold. It'd be nice to find a diaphragm material that didn't mind the cold.
I could be wrong, but this problem has more to do with physics than it does the diaphragm material. As the temperature outside decreases, the temperature of the air inside the bottle will also decrease which decreases the pressure that was built up inside. The atmospheric pressure also plays a role in the problem.