This little guy is a straight hose barb connector with double-sided threads – basically a nut on both ends that lets you join two hoses or attach a hose to a tank.
It's designed for fuel or petrol lines, so it's pretty tough stuff.

It's unbranded, and the manufacturer part number isn't listed, so it's a generic but functional part.
Made in China, and it's a straightforward design – no fancy bells or whistles, just solid metal (or maybe brass, but the listing doesn't specify).

Perfect for small engines, lawn equipment, or even automotive fuel system repairs.