In pump design, a spacer coupling is a cylindrical shaped piece introduced between the pump shaft coupling hub and motor shaft coupling hub. It gives enough space to remove the pump mechanical seal when doing maintenance, without moving either the pump body or the driver.Shafts backlash to connect in a basic and quick at least two parts of a mechanical transmission far between. The measure of the extension is adjustable to get a particular DBSE with various sorts of locks on the trees. Lengths up to 3 meters without middle help. Couplings are a significant piece of any hardware. They structure the primary and fundamental piece of the revolution instrument of any electrical and industrial machinery. Each coupling ought to be considered with arranging and thought. Various sorts of couplings are accessible and the determination depends on the specific measure of torque required or the torque weight proportion.