• Allows the to inject any dye or oil into any R-12 or 134A system.
• The injector hose comes complete with a R134a coupler and Auto Shut-off Valve Adapter for 1/4FL systems. 
• Heavy duty aluminum construction
• Refillable, any dye or oil can be used
• Easy twist injection system
• Precise injection control

Heavy duty aluminum 2 oz refillable dye / oil injection system. To inject dye or oil, simply connect the injector to the low side of the A/C system and twist the handle until you reach the desired amount. 

View Mastercool 53123 Instruction Manual