http://maccoupler.com/
These are designed to refill the small 1lb propane cylinders from larger cylinders like 20lb grill cylinders. I have no experience with these so this is not an endorsement OR condemnation. I saw them on the survivalblog.com site being listed as American Made and got curious. I have just emailed on behalf of the Prepnet asking for a sample/raffle prize. I’ll keep you informed. Looks cool, check out the video on the maccoupler.com site. If you have experience, good or bad with these then email me or check into the prepnet and share you info.
73 de KS4TI