Sorry, I didn't mean to offend anyones sensibilities here. I was just answering the original posters question as to whether or not it could be done. I probably sounded a little too cavalier about the method. I am well aware of the safety aspect. I service
by weight. The The OPD valves were introduced because the servicing agencies were sometimes overfilling the bottles. The valve makes it idiot proof. However it's just a float valve (like a carburetor or toilet float that never fail) and if the bottle is not weighed you aren't really sure of the fill. The servicers here just fill until shutoff and read the fluid meter for the bill. As to the $100 figure for the conversion I mentioned, that was for three bottles and probably a re-certification and fill so thats more in line with with the price
someone else quoted. I am in fact converting to the OPD but more for the liability than anything else. I really think it's much more serious how it's stored and used on a boat but that's another thread.