Humidifier Saddle Valve 1/4 Inch Water Supply Tap 4359

The Humidifier Saddle Valve 1/4 Inch Water Supply Tap (4359) replaces the Aprilaire 4001 piercing valve used to supply water to bypass and fan powered humidifiers from a domestic cold-water line. Designed for 1/4 inch OD copper tubing, the valve clamps onto 1/2 inch or 3/4 inch copper plumbing and uses a piercing needle to establish flow without cutting the pipe. Technicians can confirm job fitment by matching pipe size and verifying that the installation does not require a code-compliant full-port shutoff valve, which may be mandated in some municipalities. This saddle valve provides an immediate water source for new installations or service replacements, restoring proper water supply where existing valves have seized, clogged or lost piercing pressure.