Yes it looks like the fitting you would add a hose to and then connect your stove.
Actually connect stove first as once you thread your hose in you are on the high pressure side Of propane pressure.
Your fill valve is just at the bottom of your picture.
Turn off propane when connecting hoses and check for leaks with soapy water connection.
Use caution when checking previous owners connections.
Make sure the main valve is turned off when connecting barbecue.
Good luck and if you have any doubt consult a propane shop.
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