... .tank volume: 56CBM 3.passed ISO 9001 and CCC 56CBM LPG tank trailer1.one of ten biggest truck manufacturer of China2 ... ,single fluid two valve box. hydraulic legs, traction pin, liquid Indicator,pressure gauge,temperature gauge,emergency cut-off valve,valve box ... regulation on safety technology for Liquefy gas tank truck. 56CBM LPG tank trailer