Brass immersion pocket designed for Danfoss ST-1 and ST-2 safety thermostats. It allows both sensors (control and safety) to be housed together in a single Ø 9 × 100 mm sleeve, ensuring accurate and reliable measurement of the medium temperature. It is screwed into a standard measuring socket with an R ½" thread and is suitable for systems directly and indirectly connected to the hot-water heating circuit. Pressure rating PN 10, medium: water, pH 7–10, max. sensor temperature 130 °C. Material: Ms 58 brass / copper. Complies with DIN 3440 and VDE 0631 standards.