R-22a Refrigerant 12 Lb. (36 Lb. Equiv) Cylinder, Replacement for R-22 Substitute RED TEK 22a possesses similar volumetric refrigerating effects to R22 refrigerants. Operates at lower head pressures and offers improved cooling properties and performance verses R22 Can be used effectively in R22 refrigeration systems. Increased energy savings up to 30%. 100% natural organic refrigerant, non-ozone depleting, non-global warming.