The McAlpine 40K-CB is a blanking cap designed to fit onto a chrome plated brass compression tee, specifically the 42E-CB model from McAlpine. The purpose of a blanking cap is to seal off one end of a fitting, preventing the flow of fluids or gases through that particular branch of the pipe. In the case of the McAlpine 40K-CB, it is used to seal off the end of the compression tee where a pipe or other fitting would typically be attached. This type of fitting is commonly used in plumbing and heating systems, where it may be necessary to close off certain branches of a pipe network for maintenance or repair purposes. The McAlpine 40K-CB is made from high-quality materials and is designed to provide a secure and reliable seal, ensuring that the system remains leak-free and operating efficiently. ・ Used to blank off chrome compression tee (42ECB)