... product has a temperature, pressure, wear, "one drainage," "life-long self-absorption" and many other features. At present production of stainless ... during the sealing device is not friction, no wear, longer service life than similar products in more than 10 times. 3 ... "electric air control valve", truly a "one-draining, life-long self-priming." 4, little vibration, low noise, mobile and flexible, ...