The air operated vacuum pump is suitable for R134a and R12 automotive use.And with clear instruction,you 't need any complicated steps,just simply connect the air and it pulls full vacuum in less than 2 minutes. With the capacity,it is a perfect choice for automotive air conditioners,home air conditioners,refrigerators and freezers. 75 -180 air pressure is required.Besides,the air vacuum pump is a AC pump eliminates moisture from air conditioning ,making it safe and easy to refrigerant. The air operated vacuum pump is made up with PE plastic,which makes the vacuum pump is resistant to corrosion and light in weight.Also,the air operated vacuum pump has a handle,which makes it easy to carry.You can take it to anywhere. color:red material:plastic Size:about 17.5*10*8cm Package Contents: 1* Air Operated Vacuum Pump Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.