you might get by just plopping some solder on it, but it's likely copper, not brass, so go very easy on the heat or you'll have leaks all over the place .... I'd take it to a shop where they have the skills

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot