1. Completely sealed, the neck of the sealing core, the bottom of the gasket and the upper part of the sleeve of the washing machine are all equipped with sealing aprons, so as not to give opportunities for odor and pests.
2. Never return water: At present, most odor-resistant floor drains will accumulate water and return water when the washing machine has a large displacement, while non-core four-proof floor drains will never do so.