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ET20 Common Mode Choke Inductor Base 2+2 PinET20 power line inductor base. 2+2 pins ET20 coil bobbin base. Base Size=22mmX16.3mmX25.9mm. Pin pitch=13mm. ET/UT20 phenolic material bobbin base. We can make tooling to meet different dimensions. UL REC: 94V-0