Anybody know if these PVC Gate Valve, Buna-N O-Rin (1" Slip x Slip (Schedule 80)) sold on Amazon are any different from the ones BRS sells? This is the third time I'm re-plumbing this line on my Red Sea 250 so I wanna save a few bucks is possible. The "Buna-N O-Rin" part is making me wary.