A gate valve works much better than a ball valve. It's much more precise to dial in perfectly when used for the return flow. I used a gate for my return & ball for my manifold. The ball is hard to adjust & tends to stick. Gate always has smooth minor turns. A lil more pricey but I believe it's worth a few extra bucks on that part. Nice holes btw. Surprised they came out so smooth with very little water flow. I wanna plug my bottom drilled tank & do a coast to coast overflow. I got in a hurry & didn't wanna wait. Good job with the patience! LolAlso, I am definitely going to put a union right after the pump outlet. There will also be a true union ball valve just incase I need to make minor adjustments. According to Ecotech, a mp10 and mp40 would be ideal for a 48x18x21 sps tank. So I think I am going to run an wp-40 alongside the wp-25.
Might order some nice valves from BRS if Grainger doesn't carry anything. The true union ball valves are actually pretty nice and pretty easy to opne/close.







