铜缸有祈福祛灾的吉祥作用，铜大缸厂家，又称“门海”、“福海”、“吉祥缸”。同时，大 缸也是一个循环的“小五行”：金生水、水克火！紫禁城中最豪华的鎏 金铜缸摆置在象征皇权的太和殿东西两侧，据说每次鎏这种规格的大铜 缸要用去3公斤黄金。故宫里的一些大殿前、庭院中都摆放着一个个这样腹宽口收、容量极大，而且装饰精美，两耳处还加挂着兽面铜环的金属缸。这些大缸除了有装饰作用外，其主要功能为储水防火，因而又被称作“吉祥缸”，“太平缸”。据《大清会典》记载，宫中共有大缸308口。但世事沧桑，由于各种原因，如今只剩下231口了。这些大缸共分为铁、铜和鎏金铜三种。一般来讲，铁缸是明代时铸造的；铜缸有明代的，也有清代的；鎏金铜缸则均是清代铸造的。

Copper cylinder has the auspicious function of praying for good fortune and dispelling disaster, also known as "Menhai", "Fuhai", "auspicious cylinder". At the same time, the cylinder is also a cycle of "small five elements": Jinshengshui, Shuike fire! The most luxurious bronze VATS in the Forbidden City are located on both sides of the Taihe Temple, which symbolizes the imperial power. It is said that every time a large copper vat of this size is used up to 3 kilograms of gold. In front of some palaces and courtyards in the Palace Museum, there are metal cylinders with wide abdomen, large capacity and exquisite decoration, with copper rings on both ears. In addition to decorative functions, the main functions of these large cylinders are water storage and fire prevention, so they are also called "auspicious cylinders" and "taiping cylinders". According to the Daqing Huidian, there are 308 large cylinders in the palace. But for various reasons, there are only 231 people left in the vicissitudes of the world. These cylinders are divided into three types: iron, copper and gold and copper. Generally speaking, iron cylinders were cast in Ming Dynasty; copper cylinders were cast in Ming Dynasty and Qing Dynasty; gold cylinders were cast in Qing Dynasty.