This McAlpine DC4-BL Blanking Cap is designed to seal a 4"/110mm diameter pipe made of cast iron, plastic, or clay. Manufactured from durable polypropylene, it provides a secure and reliable seal, preventing water or debris from entering or exiting the pipe. It is suitable for all domestic repair, maintenance, and improvement work, and can be used in a wide range of applications, including domestic and commercial plumbing systems. Easy to install.