• R1234yf low side coupler with extended disconnect sleeve and meets SAEJ639 and J2888
• Heavy duty, anodized aluminum, 2 oz container with dye scales represented in 1/10 ounce, 1/4 ounce and milliliters
• Nylon barrier blue hose meets J2888, EPA, SAE and UL standards

The Mastercool 53123-YF is an oil injector, To inject the oil or dye, simply connect the injector to the low side of the A/C system and twist the handle until you reach the desired amount. The injector hose comes complete with a R1234yf coupler.