Truck Spare Parts Air Suspension TRL-270T , OEM piston steel 1K6834 air spring. .Guangzhou Viking Auto Parts Co., Ltd. is a professional manufacturer in designing and producing air springs .We have obtained IATF 16949:2016 and ISO 9001:2015 certification. Our products are greatly appreciated in OEM and after market. All the VKNTECH product will apply the below testing before delivery Physical test, Diameter detection, 24Hours air leakage test, Characteristics test, Blasting test. All the Results agree to the GB/T 13061-2017 test requirement.