Dye & Oil H&-turn Injector for R-134a & R-12 Systems Does not require Manifold Gauge to use on low side of pressurized systems Great for introducing 1/4oz. (7.5ml) up to 2oz. (60ml) of U/V Dye, Lubricants & Leak Stop (ST22) to closed A/C systems without adding refrigerant Quick connect style for R-134a systems (may also be used on R-12 systems) Supercool Part No:15290