What Thread is the Propane Sealing Plug

Question:

The item looks like a 1/4inch inverted flare plug, but the description says 1/4inch NPT. The 1/4inch NPT would be flat on the end, correct? I need the inverted flare, I dont want to order the wrong part. I watched the video just to make sure, the narrator said its 1/4inch NTP as opposed to NPT. Not really a big deal, but that was the part I needed cleared up. Im almost sure that they are not interchangeable. Could you please confirm the threads on this item? Thank you

asked by: Rick L