Comparison of advantages of water pump and air pump：
The pressure created by the air is unstable and creates an uneven vacuum that can cause the penis to bend and bulge.However the pressure created by the water is balanced and stable, and as the water drains, it creates an even vacuum around the penis and allows for expansion without damage such as bending and bulging.
X20, X30, X40 Pumps belong to water pumps
X20、X30、X40 water pump size：
X20 pump：1.96inch*7.48inch （Suitable for penile erection length less than 15cm）
X30/Max7 pump：1.96inch*8.66inch (Suitable for penis erection length greater than 15cm and less than 18cm)
X40 pump：2.56inch*9.84inch (Suitable for penis erection length greater than 18cm and less than 22cm)
There would be some difference as it was measured by hand
Xtreme pump full set
The material is made of environmentally friendly plastic and silicone, which can be used with confidence
Product detail presentation
X20 X30 X40 pump Instructions:
