For Sony A7 III A7R IV III A9, for Panasonic GH5, for Nikon Z6 II Z7II Camera hoursing with Vacuum Pump System Design (More compatible models please check the description)
The vacuum pump system is used for checking the water tightness of underwater camera housing before submerging
The complete electronic circuit and the battery are located in the robust anodized aluminum one-way valve body for even more convenient operation and ease of installation