A/C R1234YF Quick Coupler Connector Adapters High/Low Manifold AC Gauge Auto Set

Blue is R1234YF low side quick connector, its 14mm female x 1/4" SAE male. Red is R1234YF high side quick connector, itss 17mm female x 1/4" SAE male. The R134A to R1234YF quick coupler has an auto-off function, making it easier to remove and install.