Did you mean seacock or check valve? check valve is used if you have a home made tank that fills from below the tank. most tanks have tubing at the top with prayer side of tank preventing water draining if pump is off. I have two bait tanks with two 1100GPH pumps able to fill either tank(s) with either pump(s) or both running at the same time. Check valve prevent back flow of water to pump if one is turned off..
Hi 4v1df12h1ng I am adding seacocks it did not have them but for some reason it did have check valves. I do not think the check valves are needed but wanted to make sure. Currently there is only one pump for both tanks I am planing on adding another. I like your setup whee either can fill either tank I might try to figure that one out.