Can anyone tell me if the flaring of the brake-pipe should be like a trumpet, or like a, ehhh, "inverted trumpet" (double flared so to say).
I haven't got my mastercylinders yet, but s/o is going to make me a brakepipe, so I have to know.....

The trumpet is the double flare, the cone shape is the single flare. Take your calipers (slave cylinders) to whoever is making your pipes.so they can see what you need. A lot of aftermarket calipers use braided hose with a banjo fitting and copper washers. Check with the supplier preferably.

Thanks for your response, but I'm actually talking about the mastercylinders.

I'm fitting twin mastercylinders (girling or wilwood) to my Indy, and to connect both brake-pipes for the front brakes (one nearside, one offside), I need to have a piece of tubing which goes from mastercylinder to a T-piece.

So, I need to know which fitting I need on the mastercylinder side (which I don't have at this instant).

Do I need < or <>?