This fuel tank can be used in R134A system, R1234YF air conditioning system, R12, R22 system. Oil cylinder thread 1/4SAE with 1234YF low quick connector and R134A adjustable low pressure connector, plus R134A system oil quantity detection cotton Rated working pressure:3000 psi burst / 600 psi Max. working pressure. Oil cylinder is filled with 2 ounces of refrigeration oil, check valve screwed onto and tightened. The inner and outer cylinders are tightened clockwise, and then a little 1/4 SAE threaded inner core is used to discharge a little air inside the blue tube. Connect the low-pressure port of the refrigeration system that needs to be refueled, and add the required amount of cooling oil to the inner and outer cylinders. [Widely used for charging A/C systems] - 1.Addition of oil to the system 2.Re-oiling the system after a change 3.Add Scanner Fluorescence Solution 4. of additives into the system [Easy to use] - Filling the A/C system is easy with the oil dye injector.First, start the air conditioning and set it to the maximum cooling setting, then connect the injector to the low side. step is to use the measuring cup to measure the amount of paint or oil you need, then pour it into the body of the pump and tighten the cap. Finally, turn the knurled knob and the piston gently push the paint or oil into the A/C system. Tank Capacity:1/4oz/7.5ml (Min)-2oz/60ml (Max). Connections:1/4inch SAE Female. Colour:Silver Material:Metal Package Contents: 1 * AC Oil Dye Injector Kit For R134A System set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.