<p>Connect high- and low-side service hoses with this two-piece automotive A/C quick coupler set. The kit includes one red high-pressure coupler and one blue low-pressure coupler for R1234yf-to-R134a adapter setups.</p><p>Brass fittings feature 1/4-inch SAE female connections, with 16 mm high-side and 13 mm low-side couplers as specified by the linked product. Check your vehicle and charging equipment connections for compatibility before use.</p>