Underwater full protection device

An underwater full protection device comprises an inner cover, a floor drain body and an O-shaped ring and is characterized in that a circular-truncated-cone-shaped groove is formed in the lower bottom of the inner core, and a butterfly-shaped ring is mounted in the groove. The problems that an existing floor drain is hard to mount and maintain, and peculiar smells, harmful gases and the like return upwards are solved, and the underwater full protection device is suitable for deodorization in sewer drainage systems of kitchens, toilets, common bathing pools and other occasions. 种下水全防装置，包括内芯体、地漏体、o型圈，其特点是，内芯体下底留有圆台状凹槽，槽内装有蝶形圈。它解决了目前地漏安装维修困难，异味、有害气体等上返的问题，适应于在厨房、卫生间、浴池等场所的下水道排水系统中防臭。