45* Din X F Din Swivel

The male end threads into a female DIN port, and the female end receives a male DIN tube fitting, so you're building a swivel connection at a 45-degree angle between two points in a hydraulic line. It's not a straight inline coupler. The 45-degree elbow shape means you're using it where the line needs to change direction and you want rotational flexibility at that joint to reduce stress on the tubing.

Built as a 45° elbow, it gives you an angled turn, and the female DIN tube end is a swivel for easier alignment during hookup.

Correct, this Adaptall fitting is a 45-degree elbow. It's designed for DIN tube connections on both ends, one male and one female, both M18 X 1.5, and size S10.