The Mastercool 53134 is a Refillable Dye Injector (R134a Auto A/C System). 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 R134a coupler and auto shut-off valve adapter for 1/4″FL systems.
Product Features:
- Refillable Dye Injector (R134a Auto A/C System)

