This standard specifies the type, technical requirements, test methods, inspection rules, signs, packaging, delivery documents, transportation and storage of compressed natural gas filling ports for automobiles (see GB/T 17895 for definitions). This standard is applicable to the compressed natural gas filling ports for automobiles that use compressed natural gas for automobiles that meets the requirements of SY 7546 as the working medium, and whose nominal working pressure is 20 MPa (the pressure values stated in this standard are all gauge pressures).