Shenzhen Longer Industry Co., Ltd., founded in 2003, engaged in the R&D, production, sale and after-sales service of various gas plants . We have exquisite technology, a high-quality professional team, advanced equipment and complete testing methods. Our main products include air separation plants, portable oxygen cans, liquid nitrogen containers, cryogenic liquid pump,vaporizer and all kinds of pressure vessels. Our products are widely used in many industries, such as metallurgy, aviation, ...