This useful tool is ideal to use to add UV dye or PAG oil (can be used any other) leak tracer and/or lubricant to the automotive air conditioning system. Very easy to use. You need to remove / unscrew the end cap of the air conditioning hand twist tool (sometimes this is the hardest job of all). 

You set the require quantity  fill the cylinder with the chemicals you want to inject the AC system. On the side of the cylinder are markings indicating the amount so you will know how much additives you have poured inside the AC hand twist syringe. Make sure that the compressor is running when you push the oil in the system.

When you are connected to the low/cold side port rotate the handle to push the liquid in the set doses.

This kit contains the following:

*1pc hand-twist syringe
*1 bottle of R134a PAG oil
*1 bottle of Emkarate RL lubricant 
*1pc of low side coupler
*2 bottle of AC leak detection UV dye (Made in Taiwan)

Our Chinese presentation: