Move your propane equipment to an open outdoor area. Your work area should be free of heat sources or open flame. Ensure that the valve on your propane tank is closed and the power of your connected propane appliance is off.
Unscrew the connecting hose from your propane appliance. If the opposite end of the hose connects to a flow regulator before reaching the propane tank, unscrew it as well.
Remove the hose from the propane tank adapter. Most hoses simply screw on to the adapter, but some may require you to lift a locking lever prior to unscrewing.
Grip the adapter firmly and unscrew it from the propane tank. Set it aside for later use.
Screw your new adapter firmly onto the propane tank. Reconnect the hose, regulator and propane appliance in the reverse order you disconnected them.