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Applications: R1234YF belt Driven Compressor A/C SystemsAfter recovery of refrigerant and component service/replacement in an A/C System, any Oil lost in the recovery process must be replaced. GE-50744 is used to inject Oil into R1234YF A/C Systems that use PAG Oil. It is critical that POE Oil used in electric Compressor Systems and PAG Oil not be inTermixed so specific Oil injection Hoses for PAG and POE are required. Individual injection Hoses help assure no cross-contamination occurs. A large durable tag wrapped around the GE-50744 Hose clearly denotes it is only for R1234YF PAG Oil A/C Systems. Use with J-45037 A/C Oil Injection Kit. For R1234YF POE Oil Systems use the GE-50745 Oil Injection Hose.