Self adhesive flange disc and plastic flange cover also can protect being damaged in storage and shipping..
they also can keep the inside flange clean from dirt, debris, bird and animals.
becuase self adhesive flange disc can tight seal preserving the flange face and interior of the components
so it compare plastic flange cover advance:
Faster and Easier Installation and Removal
Can be protect flange surface from mechanical damage
during transportation and indoor or outdoor storage
Let air ,water and other liquild being separated from
flange or ther components prevent flange corrosion