The Balboa 30344 Temperature/Hi‑Limit Sensor is a 12-inch, 1/4" diameter M7‑series heater tube sensor used across Balboa Revolution, GS/GL, VS, EL, and BP spa control systems. It features a metal probe, 2‑pin flat connector, and durable construction for accurate water temperature and high‑limit safety monitoring. Designed for spa heater tubes requiring a short cable, this sensor is a direct replacement for multiple Balboa part numbers including 30042, 30382, 32016, and others. The probe slides into the heater tube and secures with a plastic nut, ensuring straightforward installation and compatibility with a wide range of Balboa M7‑equipped spa models.