I just looked. TFT make 3 different inlet sizes. 2.5, 3, 3.15. All with 2.5 outlets. Pretty much no matter what you do your limited to 500 gpms. Because thats what its designed for. The typical goto is 2.5. We used 3" with 2.5 couplings just for friction loss reasons. Our Elkhart RAN was also...