Developed to withstand the harshest diving environments, the Apeks MTX-R 1st Stage Regulator is a high-performance regulator engineered for extreme cold water. Based on the military-grade MTX, originally designed to meet the stringent standards of the US Navy Experimental Dive Unit, the MTX-R delivers exceptional reliability even in near-freezing conditions at depths exceeding 60 metres. Its innovative first stage features an over-moulded end cap and environmental diaphragm, effectively preventing ice build-up and free flow—making it ideal for technical, expedition, and cold water divers. The over-balanced diaphragm design enhances performance at depth, while the rotating turret and angled ports offer streamlined hose routing and comfort. Built with a forged body and heat-exchanging ribs, the MTX-R combines durability, thermal efficiency, and rugged dependability—an essential piece of kit for serious divers.