what chemical reaction(acidic) would you get from N2O embedding into H2O/Meth and its effect on tank and components(hoses nozzle). most dive tanks are aluminum now or steel, some are carbon fibre but $$. how about S/S foam fire extinguisher or S/S keg, modify metal(S/S) keg tap, use compressed air to move liquid. hi pressure sounds good, but might cause gas pockets and flow stalling with excess pressure pushing fluid thru hose and fittings. perfect setup would be pressure compensated air regulator to provide pressure that will atomize liquid consistantly. example; 80psi to atomize @ atmospheric pressure, 5# airbox - 85psi discharge pressure, 20# airbox - 100psi discharge. P-47 Thunderbolt system used barometric compensator, they spent alot of time and money to design, British Mesquito bomber used nitrogen to push N2O in its nitrous system(total use system)