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For Use with Boulder - Rock Closed System
Includes 2 Replacement Pods.
The Rock is a refillable open system that works with all types of fluid, for example, Max VG, 80/20, 70/30, and 50/50 fluids. Also it works great with Nic Salts.
Boulder - Rock Closed System Replacement Pods make refilling convenient and easy. Take the plug out, squeeze the liquid in. No guesswork. No Mess.