System Sensor DST1.5 Metal Sampling Tube for D4120 Duct Smoke Detectors – 1-foot
MPN: DST1.5. Adaptable with duct smoke detectors enhancing smoke detection fidelity. Facilitates easy installation and is compatible with various duct sizes. Duct Width Compatibility: 1 to 2 feet. Manufacturer: Honeywell International, Inc.