Foster fitting frustration

[oldsparky]

Leaving the restrictor in whilst using the fitting in reverse is probably not a good practice. By all means, remove it. I wouldn't worry about using micro-bore hoses. The statement about backpressure killing compressors is ridiculous. These things are high pressure, low flow rate. The backpressure will be super high just from the stored pressure in the vessel that you are filling. A micro-bore hose will still flow enough air to not create higher pressure upstream from it. Unless you see a significant increase in the compressor gauge compared to the tank gauge, there will be no extra load on the pump. To prove my point, just watch the gauges on the tank and compressor. If they remain in balance with each other during the filling process as mine does, then you have nothing to worry about.

Your point about watching the gauges is right on. Some systems determine problems by pressure differential. Which I had extreme with the restrictor screw. With the micro hose I still had about 10 bar difference. But every set up could be different because of CFM output of the compressor or the parts and or whips. For my ease of mind I will eliminate all the restriction I can. Thanks for your input. With all the different personalities and or work experiences we have the opportunity of knowing the best practice.