Coleman 1-Pound Propane Tank Adapter: Camping : Walmart.com
Please do not do a direct connect of 1lb propane tank for this usage in the vessel. Propane is heavier than air and will sink to the lowest point of the boat and wait to explode. I am sure the hosing to the ouside tank probably has a solenoid shut off for a reason,,,,protection. These 1 lb tanks teak after they have been removed sometimes and the valve sticks open
OHHH YESSS! I have had to discard a few because they leaked. Sometimes the little valve just doesn't cut off when the tank is removed from the fitting.
You won't hear it, you won't see it but if your nose is working, you can usually smell it.