Pretty sure it's called a manifold; I've seen it on RC and plan to utilize one on my current setup.  Assuming a manifold is a set of tees leading to equipment and/or refugium intake lines on a valve, set on a return horizonal pvc from a pump, my Question is: should the manifold be on the closed loop, on the return from the sump, or does it matter?
				
			 
	 
 
		 
 
		 
 
		 
 
		 
 
		