Refrigerant Tanks 30lb Refrigerant Cylinder w/SCG Y-Valve Model #: YSN301R 50lb Refrigerant Cylinder w/SCG Y-Valve Model #: YSN501R 123lb Refrigerant Cylinder with Multi Valve Model #: YSNR123 239lb Refrigerant Cylinder, 400 PSI Model #: YSNR239