据《大清会典》记载，紫禁城内曾有大缸308尊。由于历史的变迁，现约有200余尊，高度80铜大缸雕塑价格，其余的大缸多是去向不明。

According to the book of the Great Qing Dynasty, there were 308 VATS in the Forbidden City. As a result of historical changes, there are now about 200 sculptures with a height of 80. The price of the other sculptures is mostly unknown.

故宫内的大缸，又称“门海”。按质量可分为铜鎏金吉祥缸、“烧古”青铜缸和铁铸大缸三类。一类为铜鎏金吉祥缸，是比较贵重的，在故宫内的太和殿门前，就陈列着这种鎏金大铜缸，每尊高1.2米，直径1.63米，缸的上部外表面均铭刻着“大清乾隆年造”的字款，大缸的两侧饰有兽面纹铺首环耳。第二类为“烧古”青铜缸，全部为清代制造，铜大缸生产厂家，其外表油墨锃亮，非常雅致，在景运门和隆宗门前各有一对这样的大缸。第三类为明代制造的铁铸大缸，古朴素雅。

The big VAT in the Forbidden City is also called "Menhai". According to the quality, it can be divided into three types: Copper gilded auspicious cylinder, "burn ancient" Bronze Cylinder and iron casting large cylinder. The first type is copper gilded auspicious VAT, which is quite valuable. In front of the gate of Taihe palace in the Forbidden City, there is a large gilded bronze VAT, each with a height of 1.2 meters and a diameter of 1.63 meters. The upper surface of the VAT is engraved with the word "made in Qianlong period of the Qing Dynasty". The two sides of the vat are decorated with animal face patterns to pave the first ring ears. The second type is "burn ancient" bronze jars, all made in the Qing Dynasty. The large copper jars are made by manufacturers. They have bright and elegant ink on the surface. There are two such large jars in front of Jingyun gate and longzong gate. The third type is the large iron cylinder made in Ming Dynasty, which is simple and elegant.

故宫内的殿宇楼阁均为砖木结构，很容易着火，一旦发生火灾，如果不能及时扑救，火势就会迅速蔓延，把这座辉煌建筑倾刻间化为乌有。为此，紫禁城的建设者们对防火特别重视，在宫殿前设置了这些“门海”。

All the buildings in the Forbidden City are of brick and wood structure, which is easy to catch fire. In case of a fire, if the fire cannot be put out in time, the fire will spread rapidly, which will turn this splendid building into nothing. For this reason, the builders of the Forbidden City pay special attention to fire prevention, and set up these "gate sea" in front of the palace.