You started diving with yoke style cylinder valves, but you feel the higher cylinder pressure available with DIN cylinders will be an advantage to your style of diving. Well this kit will allow you to do just that, shed the yoke and increase bottom time with this 300 bar (4,350 psi) DIN conversion kit. The Kit is designed for the Aeris AT400 First Stage Regulator. DIN Converter is manufactured from Marine Grad Chrome Plated Brass for Strength and Durability. DIN Regulators allow use with High Pressure Steel Cylinders.