Brass to copper solder?

[Albumen]

Don't ask why, but can I solder this:

https://directplumbingsupplies.com/...MI_47fyKzWkwMVuZxQBh22GgM_EAQYGiABEgJZDvD_BwE

Into a 15mm straight copper coupler. I assume the outside diameter is the same as 15mm copper pipe, as it says it's designed to go into an isolating valve.

Somewhere somebody says brass takes a bit more heat. But I've got a good Rothenburger gun, with the "wrap around" guard thing. And I can do this away from the actual job, so don't have to worry about scorching anything.

 

[denso13]

Doubt it's brass, but should solder ok.

 

[avonmouth]

You could tin it first