The HydraStorm GMAK is a true gas mask adapter kit for the professional. The fittings each feature military configuration sealing valves to prevent ingress of contamination into your water supply and your mask. The valves only open when the mating parts are correctly aligned and pressed together. When disconnected, you water supply remains protected. The tube on the bite valve adapter is supplied, otherwise the integral valves block off flow for full flexibility in use. The materials and/or components selected for the GMAK are all in service with the US and Canadian Forces for handling potable water. The interface geometry for the transfer of water from the HydraStorm reservoir to the user's protective mask is the same as that used in the US and Canadian military NBC systems. Tested in OC/CD/CN environments.