Mastercool MSC-53123-YF Refillable R1234YF 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. Features Refillable R1234YF Oil Injector 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 R1234yf low side coupler with extended disconnect sleeve and meets SAEJ639 and J2888 - SKU: MDCO145165