Product Name: Gas Discharge TubeModel Number: ZM72810, 3R420BPlace of Origin: ChinaSpecifications: 1) Code: ZM 2) Outline diameter x length: Φ7.2 / 8 x 10mm 3) Representing 3-electrode: 3R 4) Nominal DC spark-over voltage: 420V 5) Bend distribution of lead wire: B