Cannon furnace

Cannon Furnace is a members-only item on the OSRS Grand Exchange in the other category.

In-game examine text: "This powers the multicannon."

It has a Grand Exchange buy limit of 70 every four hours, a high alchemy value of 112.5k gp, and item ID 12.

View on OSRS Wiki

Cannon Furnace shows an active flip setup with a margin of +5.7k gp and 685 trades over the last 24 hours.

At the buy limit of 70 every four hours, max profit per cycle is about 399.4k gp — high margin with healthy liquidity.