Chongqing Yifeng High Pressure Container Co., Ltd. is professional manufacture on high pressure seamless steel gas cylinder and CNG cylinder manufacturers in China. Yifeng has more than 20 years' experience in manufacturing seamless steel cylinders and owns the advantage of producing high pressure seamless steel gas cylinders with YM brand and four categories. ++seamless steel gas cylinder such as O2, Ar2, N2, CO2, Cl2, Sf6 ++ CNG cylinder and CNG Station cylinder (TYPE I/ II/ ...