The high-density polyethylene core lends high flexibility for tight locations, while maintaining ultra-strong structural integrity and crush resistance. This rugged polypropylene matches the strength of the spiral core, with added flexibility to handle bends and abrasions without stretching thin. Engineered for high flow. The large, smooth internal diameter is consistent within the discharge hose, so the pump in your washer will not have to work as hard when discharging the laundry water. This results in less stress on your pump, the component that usually is this first to give out.