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The two post system allows for easy builds with two large posts and has very large area for cotton wicking and juice filling. The difference between the V1 and the V1.5 is all compatible caps now sit flush at the bottom of the deck.
The deck is made from stainless steel which eliminates corrosion and has brass positive and negative posts for great conductivity.
This 25mm Deck has a solid copper 510 pin with a stainless steel squonk pin included and extra o-rings.