Washing machine door seals are made of a flexible rubber material, They attach to the outer drum front plate and is held on via a spung loaded clip or a clip which is tightened by a nut and bolt system. It is then held onto the front cabinet of the washing machine via a spring clip. Most  Washing Machine rubber door seals have a drainage hole or holes at the bottom of the seal, this allows excess water that has collected in the seal to drain away,  so when it is time to take the washing out of the machine there is no water laying in the seal so the clothes stay dry.

A large proportion of service call problems come the machine not being able to pump out the water and one the most important things you can do is to do a regular check on the filter