I've got an NOS bottle with the old style high flow valve. It has male threads for the safety valve. Does anyone know where I can get a safety valve with a blowdown tube adapter for this? Supposedly it's PN 16170NOS.

 

Were you ever able to find one of the fittings you were looking for? If not and you wouldn't mind changing the valve in the bottle i could try to get you setup with a deal on one of out new lightning valves. If you are interested shoot me a PM and i will get you setup with a price.

Here is a link to it for you to take a look.
LIGHTNING 45 BOTTLE VALVE (FITS 10LB BOTTLES)

Trey