The McAlpine 40K-CB is a blanking cap designed to seal off one end of a fitting, preventing the flow of fluids or gases. It is specifically designed to fit onto a chrome plated brass compression tee, such as the 42E-CB model from McAlpine. This fitting is commonly used in plumbing and heating systems to close off certain branches of a pipe network for maintenance or repair purposes. The McAlpine 40K-CB is made from high-quality materials to provide a secure and reliable seal, ensuring the system remains leak-free and operates efficiently.