Genuine SINOTRUK VG1246050021 intake valve for D12 420HP engines. OEM replacement for HOWO T7H and A7 series trucks. When your SINOTRUK HOWO 420HP truck starts losing power, burning oil, or running rough under load, one of the last things you might check is the intake valve — but it could be the root cause. The VG1246050021 intake valve is the genuine factory-fitted component used …