Keene 3" Jet Flare Dredge with P180. $2,995.00. Image: Keene 3" Jet Flare Dredge. The KEENE 3" JET FLARE design provides excellent fine gold recovery. The jet flare and water level sluice box gives 30% more suction allowing dredge depths of nearly 30 feet. Also, the state-of-the-art sluice box is more efficient, compact, and lighter.