The new MTX-R from Apeks The new MTX-R is based on the MTX, a regulator that was developed in accordance with the United States Navy Experimental Dive Unit extreme cold water test. Innovations in design mean that the MTX-R regulator performs in almost freezing water at a depth of over 60 metres, something that very few other regulators on the consumer market can boast. Features include a first of its kind, over-moulded first-stage end cap and environmental diaphragm. This unique design prevents ice build-up on the first stage that could cause a free flow in extreme circumstances. The forged first stage body gives maximum thermal performance while a ribbed diaphragm clamp on the first stage ensures improved heat exchange in cold water conditions. In addition to its extreme cold water ability, the regulator is rugged, strong and designed to withstand the knocks and bumps that come with life on an expedition.The MTX-R is available from your local diver retailer with both a DIN and a yoke fitting and has a SRP of £529.