1. Standard nitrogen cylinder is heavy and unwieldy to use while brazing small splits. Gauges need constant readjustment for the minisicule flow required..

We are looking at using an old r22 dumpy 9kg bottle with a bespoke small regulator designed for very low flow. Anyone else tried this? Anyone found a quick easy way to get very low flow needing little adjustment ?
What pressure did you fill r22 dumpy to for max duration?
Anyone come across a quick way to connect to ¼ 3/8 ½ 5/8 copper as required?

2. Sometimes there are only two brazes on a single split installation and these real difficult to set up. Its tempting not to use nitrogen, however having had a modern electronic refridgerent flow valve apart it looks as though even the smallest contaminant could cause a problem. There are inline gauze filters on these. Your opinions valued folks…. (leave out the warranty issue, we are looking at the level of risk for malfunction over life of unit on a difficult setup with limited number brazes on the odd occcasion..as allways one callback or malfunction completely negates saving couple hours time…)