Some
of the sellers sell similar kit for less.Please note they offer less
pipe with their kit.Also they do not offer electric valves known as
actuators. It's recommended to use as much pipe as possible.The purpose of it is to even floor temperature as the flow and return lie adjacent to each other. That's leave fewer cold spots. That's save your energy required to heat the floor.
4 port complete manifold(pipe connection,isolating valves,automatic air vent,pressure gauge,flow meters)