One thing I am disappointed in GHL is the size of the 2377 GPH Flow meter and unions. They size them at 3/4 in, that is to small. IT should be at least 1 in. How many pumps have the horsepower to actually push 2377 thru a 3/4 in hole. I will have to step down my return plumbing from 1.25 to .75 to make it work, thus, more head pressure on a pump. The Apex flow meter does the same, but, they do have a massive 2 in option, but the weight of that flow meter...UGH!!! I feel they both have some redesigning to do on their flow meter diameters and options. I am going with GHL flow meters on my return rebuild because I like their method of reading flow vs. Apex. I have seen my Apex flow meters steadily decline, flow wise. Is it the meter or the return pump, after 6-7 months? Impellers get dirty as do the pumps, SO, which one is it.