5 layers or 12 broilers per nipple, Combi plastic nipples are often used in plumbing and irrigation systems to connect different piping materials together. They are lightweight, corrosion-resistant, and easy to install. The purpose of using combi plastic nipples is to create a secure and leak-free connection between pipes or fittings with different materials. These nipples are commonly used in residential, commercial, and industrial applications where a reliable and durable connection is required.