Astral Pipes 50mm x 40mm Reducer coupler now readily available at best prices. Specifications of the coupler:

A coupling (or coupler) (used in piping or plumbing) is a very short length of pipe or tube, with a socket at one or both ends that allows two pipes or tubes to be joined, welded (steel), brazed or soldered (copper, brass etc.) together.

Reducer coupling is used for joining a pipe to another pipe of smaller diameter

About Astral:

Astral is India’s One of the leading manufacturers of Pipes and accessories. Astral has been operational in India since 1996, striving to serve consumers to the best of their abilities. ASTRAL constantly strives to upgrade processes and materials, incorporating international developments in the plumbing industry to benefit the customers. ASTRAL offers innovative product designs, created using extensive industry know-how coupled with the latest technology to assure world-class quality.