Extension Tube is designed for Tauren/Tauren Max/Tauren Hybrid/Tauren Hybrid Max Mech Mod. It can enable the mech mod to be compatible with two batteries and obtain stronger power. Please note that Thunderhead Creations Extension Tube cannot be used with X Chip, please take out the X Chip before using Thunderhead Creations Extension Tube. May Thunderhead Creations Extension Tube offer you safe and amazing vaping enjoyment.