thing to have on hand or make sure to salvage - there's a couple current LP tank fittings >>> an adaption of the old old LP tank valve fitting - now a fine threaded interior and square exterior thread - there's also now a more common quik-couple type hose fitting - make sure you can utilize both types of fittings ....
in a severe as hell SHTF or even TEOTWAWKI - any opportunity to salvage fuel - especially like the common suburban backyard BBQ gas grill LP tanks - make sure you can utilize any kind of tank you can salvage .....
another LP accessory to have in your private stock - the extension hose to adapt from the 20lb tank to the 1lb bottle fitting ....