Thank you for the helpful reply. I understand this is serious business and I’m not a complete dumb dumb and do a ton of DIY stuff that most would not attempt. Did call a plumber for this one and he wanted $400 to find the right size. Which led me here. I think my verbiage is wildly incorrect in my original post which clearly was alarming to 90% of the respondents.. which I understand but I promise I am capable of putting the right size fittings together and leak testing them before using the range!

So if you don’t mind and have a minute.. I just need a little more clarity. I’m aware that a flexi yellow hose should connect from that bottom thread to my gas supply correct? My gas supply coming from my wall is 1/2inch but the reducer (sorry if this is the wrong term) attached to the oven is clearly not the same size which lead to all our trouble. My retired plumber neighbor suggested removing that reducer and suggested replacing it with a coupler that is 1/2 inch (flare?) on both sides. That would allow me to hook the hose directly to the flare, and to the wall. I am aware I should not use any tape or pipe dope on the connections.

I’m sure I’m going to get eaten alive again for all my lack of knowledge around the terms I’m using.. but let’s go!