What is this

[motomatchless]

Hello all, I am sure someone can tell me what this box is , it is the fuel line between the fuel tank and fuel pump.
I think it is not a regulator but maybe a anti return valve.
What make is it and where can I find one, just in case I ever needed one.
I have no problem with the car but I am simply curious to know what it is.
Many thanks in advance for your help.
Christian.

[motomatchless]

[motomatchless]

Thank you Philpot, I am a little bit more clever now, never too old to learn
I also changed the fuel hose in engine bay, I am lucky that I did it before Spa, it was in a bad state, it started to leak when I touched it.
I replaced it with a Gates barricade.

Christian.