DoubleDouble Product Features:

• 25mm extendo tube that allows you to add an additional 18650 battery to your Comp Lyfe tube.
• You only need ONE Comp Lyfe tube to make the DoubleDouble Extension function.
• All DoubleDoubles come with 1 DoubleDouble extension tube + 1 DoubleDouble donut contact to connect the batteries.

DDiesel Hybrid Top Product Features: 

• Use the DDiesel Top + DoubleDouble + 1 DD Donut contact to convert your DoubleDouble into a single tube (button housing sold separately). Spare Donut contacts are NOT included with the purchase of a DDiesel top (you should already have a donut contact from the purchase of your DoubleDouble).

OPERATING INSTRUCTIONS

>>> Step 1: Tighten deck onto DDiesel, set aside.

>>> Step 2: Thread button housing onto DoubleDouble device, then insert battery- positive side up.

>>> Step 3: Place DoubleDouble Contact on TOP of battery.

>>> Step 4: Tighten DDiesel top onto DoubleDouble and adjust housing for battery rattle.

For more information, view the instructional video on this listing. 

Choice of: Brass, Matte Black, Murdered Out, Smooth, and Diamond knurl.

DoubleDouble Donut Contact Product Features:

Delrin insulator press-fit with a copper contact specially made for the DoubleDouble Extension Tubes.

• For use in a standard DoubleDouble stacked setup, place contact in between your two batteries.
• For use with DDiesel Hybrid Top, place contact directly between DDiesel top and battery.