Can anyone analyse the principle of the power combiner?

I have got a "power combiner", it's power rating is about 1000W. But I can't understand how it works, Can anyone do some analysis for it?

The attanchment is the photo of the combiner.

This is a quarter wavelength long tube shaped transmission line, having an impedance of sqrt(z1*z2), where z1 is 50 ohm and z2 is 25 ohms. This gives an impedance of sqrt(50*25)=35.36 ohms of the quarter wave transmission line. Loading the end closest to the camera with two 50 ohm loads in parallel (the two N-connectors opposite each other) gives 50/2 ohm = 25 ohm matching.

It is not a matched power splitter with isolated outputs. It's a TEE.

To VSWR:

Is the two N-connectors opposite each other isolated?

The Attached picture is not clear in 3D view.
How may N-connectors are there. There should be 3 but I can see only 2 clearly.
I think it is some kind of filter than splitter.