• Chrome Plated Brass: Durable and corrosion - resistant for long - lasting use! • 5/16" ID: Perfect fit for your needs! • Ideal Sealing: Works with grommet to seal coil to faucet shank! Chrome Plated Brass Ferrules For SS Cooling. 5/16' ID. (please check OD of your coil). This is the ferrule under the hex nut, works in conjuction with grommet to seal the coil to the faucet shank.

This 5/16" chrome plated brass ferrule is great for jockey boxes. If you're someone who loves using jockey boxes, like home brewers or bar owners, this ferrule is for you. It's used to seal the coil to the faucet shank in your jockey box. The ID is 5/16 inches, so make sure to check the OD of your coil for a proper fit.