Diving regulater,first and second stage regulator

Diving regulater,first and second stage regulator The piston first stage 1.Type-Flow through piston and balanced diaphragm design; 2.Dry ambient chamber; 3.Balanced diaphragm design; 4.Thermal Insulating System(TIS); 5.Anti Freeze system; 6.4 Low pressure ports;1 High pressure ports; Second stage regulator: 1.Adjustabl stage II regulator; 2.Color available: black,red,green,yellow; 3.Coome with food-grade silicone mouthpiece.