The Kanger Protank 4 the successor to the popular Protank series sub ohm tanks. The much improved Kanger Protank 4 system is constructed of 304 stainless steel and glass. Complimenting both lung to mouth and mouth to lung vapers, the Protank 4 by Kanger features a gold-plated 510 contact pin and huge liquid capacity of 5ml's. The innovative side twist fill option, provides easy filling and eliminates the mess. The Kangertech Protank 4 also offers a symmetric airflow valve and an adjustable airflow drip tip, delivering maximum cloud production. The Protank 4 is compatible with a variety of coil structures such as the SSOCC, OCC, new ceramic coils and RBA decks. The Kanger Protank 4 includes the following resistances: 0.5 ohm (15-60W), 1.5 ohm (10-26W) and a prebuilt 0.3 ohm dual parallel Clapton. The PRO rebuildable atomizer features a larger build deck and improved airflow, allowing customized builds with thicker wire. The Kanger Protank 4 perfectly accommodates both new and experienced sub ohm vaping.