This Dual T Battery Contact is offered for those without metal fabrication abilities to make your Modular Mod build easier. This print is intended for use with the Bottom Dual Squonker Print which is a negative contact for the batteries and the Squonker Chamber . If your intention is to use this part for a three battery Modular Mod configuration a special balancing charging circuit should be utilized! The use of a 1/4-20 threading tap may be needed and a 1/4-20 threaded brass insert should be soldered to the interior side to receive a D-ring screw. All safety measures, precautions and electrical calculations should be addressed and utilized in the fabrication of this product. Your safety is your responsibility.