Neck plug of liquid nitrogen tank

The utility model relates to the technical field of accessories of liquid nitrogen tanks, in particular to a neck plug of a liquid nitrogen tank, which is made of an EPP (expanded polypropylene) material and is formed by foaming through a mold, and the neck plug is not easy to dirty, washable, long in service life, not easy to break and not easy to damage due to the fact that one layer of crust layer is arranged outside the neck plug. 本实用新型涉及液氮罐配件技术领域，特别涉及一种液氮罐颈塞，所述的颈塞的材料为EPP材料，所述的颈塞通过模具发泡成型，本实用新型的颈塞EPP材料，且由于外部的一层结皮层，因此不容易脏，且可清洗，寿命长，不易断，不易损。