Piston Ring Set Assy for HISUN 400/500 ATV UTV HS CODE 13120-004-0000 1311A-004000-0000 P0040001311A0000 This piston ring set is designed for compatibility with HISUN 400 and 500 models used in ATV and UTV applications.The set includes all necessary rings for complete piston assembly, engineered to meet specifications.It supports proper compression and oil control within the engine cylinder.Installation requires standard mechanical tools and knowledge of engine internals.This part corresponds to HS code 13120-004-0000 and alternative part numbers 1311A-004000-0000 and P0040001311A0000.correct fitment by verifying model compatibility before installation.