Floor jet manifold
Definition
The buried plumbing trunk-line that feeds a row of ground-level spray nozzles from a single supply pipe, allowing many jets to fire simultaneously on the same timer cycle and pressure.
Floor jet manifolds are the hidden plumbing that makes a linear water spray work. A single 2–4 inch supply pipe runs under the deck and tees off to 8–20 individual nozzles spaced 12–24 inches apart. One solenoid valve controls the whole row.
Manifold design directly affects spray quality. Pressure drops along the manifold mean the last nozzle gets less water than the first unless the pipe is oversized or fed from both ends. Premium designs use a looped manifold (fed from both sides) to ensure every jet fires identically. Manifold leaks are the most common splash pad maintenance issue.