Check out the BRS reactors about 40 bucks a piece and i daisy chained them too, i have a manifold with 3/4 output with a valve on it reduced it to the 1/2 fitting it uses, each reactor has it own valve, i used those slip fittiings that it came with i dont know what you call em they use hard plastic piping you just slide em in and the seal themselves, you can buy the male threaded part and connect it to the manifold and the other end has the 1/2" slip on fitting. so far no leaks and clean looking, check em out in my gallery they r on the right hand side of my sump, if you need close ups pm and i'll send em.