This device is self-designed based on German plug standards. EN737-1998 manufacture Various shape classifications can never be interconverted. Easy to install, high or low mounting height is optional. Air tightness detection reaches 100% QJIX A QJIX B QJIX C QJIX A-26
The type C is equipped with a built-in, one way valve so that overhaul can be easily carried out in the event ventilation is needed.