Quote: Vacuum isn't very accurate esp with the HF pump. Dry nitrogen is the way to test with a true pressure of what the system would run. 134 is great if you want cancer...
Am I missing something? As long as OP has good gauges that's all that matters if he can manage to pull vacuum.
BTW,OP , the HF little red plastic box/pump works just fine for quick vacuum ,as long as you have air supply to operate it. I use it all the time.
