Snap-On ECO DUAL GAS Manuel D'instructions page 9

 Wear protective garments such as to ensure that no jets
of liquid or gas can come into contact with the skin.

Wear goggles to avoid contact with the eyes.
 Avoid dispersing the R134a and R1234yf refrigerant fluid utilized in the
machine into the atmosphere.
Mishandling of pressurized R134a and R1234yf containers can cause loss of
Consciousness, injury or death.
INSTRUCTIONS MANUAL
9