The SD4 is a bottom coil – by: Suzie

The SD4 is a bottom coil, dual coil clearomizer with 1.8 ohm resistance and 1.8 mL capacity tank. It also has a spring loaded battery connection pin for solid battery contact. The SD-4 has a needlepoint hole to allow top filling convenience. Fits all ego threaded batteries. Available in Black, Blue, Clear and Pink.
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