
I have used it to inject colorant in R410A 3.5 and 4 ton units. This worked well - be prepared to put a lot of pressure on the syringe. I'm guessing the mechanical advantage of the piston could be 8:1, but when you get 135psi on the bottom it's still a bit of a struggle. Delivered early in excellent condition at a great price.

๐จ Robinair (15115) VacuMaster Single Stage Vacuum Pump - For Efficient Single-Stage Vacuuming, Delivers 1.5 CFM
9 Review

๐ฌ๏ธ UView Airlift Cooling Checker 550000
9 Review

VIVOHOME 220LB HVAC Electronic Digital Refrigerant Charging Weight Scale โ High Precision with Protective Case
9 Review

๐ UView 560000 Combustion Leak Tester: A Reliable Tool for Efficient Diagnosis
9 Review