Rectangular End Caps With Size 50mm to 800mm are used for the purpose of enclosing a pipe on every end, the Rectangular Pipe End Cap is the best solution. It basically functions as a product to close the pipe from either end. It is a type of pipe fitting which is used on the end of a pipe/tube or equipment nozzle. The main purpose of the end cap is to protect the leakage from the pipe end or isolate the pipe end as well.