The bottom irrigation connector can be used in conjunction with all kinds of four -bottomed joints that require all kinds of APIRP 1004 specifications. Use during the loading and unloading of gasoline can greatly reduce the liquid running damage during disconnection. Designed to efficiently fill all kinds of fuel and oil products-standards equipped with high-performance seals, with excellent abrasion resistance and oil resistance. Designed to be a structure that is not easy to cause racks of loading frames-the new, convenient, and automatic alignment structure used by it can ensure close coupling with the tanker car joint and prevent side stress.