The Viper 21700 by Purge Mods  is a real looker, heavy hitting piece of hardware. The Viper tapers to 28mm at the top which ensures for a minimum voltage drop and maximum output and features some exquisite CNC  machine work and  divots from top to bottom. Designed for 21700/20700/18650 batteries.
 
The button housing is comprised of 3 very strong magnets which ensure a comfortable throw and one hell of a hit and one beefy copper contact pin. The threading on each mod is flawless and they are weighty too, these mods ooze high-end quality. This mod comes with a rugged, hard shell carry case. 
 
The Viper Mod Features
Tapers to 28.5mm on top
Fully adjustable button to compensate for battery rattle
Deep CNC engravings
Hybrid top
Locally made in Orlando U.S.A
 
The Viper Mod Contents
1 x Viper
1 x 18650 Adapter
1 x Carnage Deck
1 x Matching Viper Cap
1 x Hard shell carry case
1 x Certificate of authenticity
 
Use special caution when working with Li-ion (Lithium-ion), LiPo (Lithium-ion Polymer) and any rechargeable cells, as they are very sensitive to charging characteristics and may explode or burn if mishandled. Make sure the user has enough knowledge of Li-Ion (Lithium-ion), LiPo (Lithium-ion Polymer) and any rechargeable cells in charging, discharging, assembly and storage before use. Always charge in/on a fire-proof surface. Never leave charging batteries unattended. Do not use any rechargeable battery as well as any battery charger if any visible damage is present, as well as if the cell or charger has been stressed through mishandling, accidental or otherwise, even if damage may not be visible. Always store and transport rechargeable cells in a safe, non-conductive container in a controlled environment. Dispose of all battery cells and chargers in accordance to local laws and mandates. Vapourizen will not be held responsible or liable for any injury, damage, or defect, permanent or temporary that may be caused by the improper use of a Li-ion (Lithium-ion), LiPo (Lithium-ion Polymer) and any rechargeable battery/batteries. Please have a basic understanding of the batteries you are using and how to care for them properly. All pictures are based on practicality, copyright reserved.
 
Mechanical and rebuild-able devices are for advanced users only—not for beginners or intermediate users. Understand Ohm's Law and how to use a multi-meter or ohmmeter to check for the resistance or for shorts in their coil builds before utilizing these devices. These materials cannot be safely used by those without basic knowledge of how these devices function. Please ensure proper precautions are taken when using these devices so as to not cause damage and/or harm to the battery, mechanical mod, atomizer, yourself or others. Vapourizen will not be held liable or responsible for any damages caused by misuse or mishandling of these vaping products and devices. Use at your own risk.