Plumbing... Need help

[ZachAttack]

OK, I'm getting a new tank and adding a sump. I have a pump that is only 1/2" output so I am going to put an adapter on it to go up to 1", giving me more volume and less likely hood of obstruction. I need a Male - male threaded piece, one part goes into the pump and the other threads into the adapter for 1" pvc. However, I can only find the male-male adapter in brass or poly ethylene... Are either of these reef safe?? If not any suggestions on how to change my plumbing from 1/2 to 1"????