27 seat natural gas bus . 120000Km quality warranty ,10M . automatic gear box , Euro 5 natural gas engine hengtong bus co.ltd. one of the largest natural gas bus manufacture in china . with the expereince we cooperate with Hengtong on diesel engine conversion and cng cylinder project . SYP is authorized distributor of hengtong natural busHengtong CNG bus cover mini bus, 9 to 18 city bus . and ...