Because no such tee exists. Brass tees can only be bought in same size branches. If I could buy an off the shelf (and I do obviously from the other tee as you can see), I would. I mean, why else would I spend 3 times as much to make something I could buy?

Now, you could build a tee using brass fittings, but that option is huge and weighs a ton. It's about as ugly as crap too.

Like I said before already. I could spend 1.50 and use the plastic tees (that's my cost in bulk), but was quickly warned from using them from the supplier for failure reasons. I don't pick a part or make a part that might be easier. When you send out 50-100 a week of anything, you simply don't want even a 1% failure rate. So, with that in mind, if I was having the nightmare that some must think I'm having, wouldn't I just use a plastic fitting or brass (doesn't exist anyway) if that would solve it?

Bob