Overflow in the drains of washing machines causes because of the two major reasons including clogged drains or drainpipes which are very small in diameter and are not able to handle the required volume of water. Clogging is however the most common cause and the only way to overcome it is to install the Washing Machine Overflow Hose. When correctly fitted with the washing machine, these hoses have a smaller failure rate than the other types of hoses.