Rectangular corrugated rectangular bellows expansion joints are widely used in central air conditioning pumps, fire pumps, pump life to import and export, effectively reducing the host vibration, noise absorption pipes, protective equipment, extend equipment life, including: durable, resistant to high temperature, high pressure, corrosion, environmental protection and other advantages. Effective solution to the old soft rubber joints caused by unsanitary, easy to aging, pressure unstable, delamination tear, blasting and other adverse factors, to solve the worries of the pumping station.