Quote Originally Posted by alton View Post
Remember if you are using barbed fitting they reduce your 1" to 3/4"
No flexible tubing for me Alton. I'm going with rigid PVC on the drains and the return.

Thanks John, Dean, Kevin, and Bill. It's been a while since I've calculated flow density using bernoulli's equation, but a larger diameter should lead to less pressure. But dean is right that the 3/4 inch outlet on the mag would limit the flow.

But my eventual plan is to go back to an external iwaki which has a 1" outlet. Kevin, the tank has dual overflows with 3/4 inch returns. I'm leaning to sticking with the current 3/4 lines based on y'all's feedback and then upgrade to 1" lines when I buy the new iwaki later this year.