This heavy duty faucet wrench is an essential tool for draft beer system maintenance and repair. It comes in handy if youâre changing out tap faucets or need to replace some internal parts. One side is a spanner wrench that helps tighten draft beer faucets to shanks or towers. The other side is a hex nut wrench which tightens the nut on your keg coupler This spanner wrench is made from heavy-duty metal, it has a curved end and hook that makes it easy to loosen and tighten your draft beer faucet. If the faucet is not fastened tight enough, you may experience a leak.