Brass nipples are commonly used in plumbing applications and hot water distribution lines. Brass features great corrosion resistance from salt water, acids, minerals, and peaty soils contained in water. Brass is a soft metal that is easy to install and creates a tight seal. It offers many of the same advantages of copper, but brass provides a heavier wall. Lead-free brass replaces the lead with silicon, bismuth or mixed copper alloys to ensure safe potable drinking water in accordance with the Federal Safe Drinking Water Act.