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These air transfer devices, also called cross-overs, are used to equalize pressure between 2 dive cylinders. Each unit has a 2-foot service hose and a bleeder vent on one end. Both DIN and standard/yoke models are available.
DIN service hose is good for up to 4,500 psi.
Yoke service hose is good for up to 3,200 psi.
CAUTION: These products are NOT intended for pure oxygen or Nitrox service. Special models are available for that purpose.