M16 Vacuum Valve II ~Pushbutton ReleaseTo install the vacuum valve first remove the plug of the M16 accessory port from the housing. Next, Remove the cap from the vacuum valve. Check that the O ring is in place where the vacuum valve comes in contact with the housing. Lastly, tighten the vacuum valve to the housing with the tool provided. Note: Slightly lubricate the O ring that comes in contact with the housing with Nauticam lubricant. Technical Specifications Depth Rating 150m split