For R1234yf Low Side Adapter: Blue for R1234yf Low Side Quick Coupler: 14mm female x 14SAE male. R12 to for R134A Adapter Connector: 14 SAE female x low pressure 13mm for R134A quick coupler. for R1234yf High Side Adapter: Red for R1234yf High Side Quick Coupler: 17mm female x 14SAE male.
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