The Innokin Zlide tank is not designed to replace the Zenith, but rather to offer a more cost-effective solution while addressing some requests from Zenith users. The tank is compatible with the entire Z-coil line and maintains the same easy and clean coil replacement system you've come to love from the Zenith. Removing the mouthpiece first allows the top cap to slide open. With the mouthpiece in place, the cap is locked closed. The tank can also be unscrewed in order to clean the inside or replace the glass tank section. The top slider can also be disassembled to replace the silicone seal.