The Double H Valve is a two-way air valve, one of which realizes the 1st, 2nd, 3rd, and 4th gear shifts, and the other way realizes the high-speed 5th, 6th, 7th, and 8th gear shifts through the auxiliary tank.
SINOTRUK HOWO Truck Parts Double H valve WG2203250003 is suitable for SINOTRUK and other heavy duty brand trucks. Especially for HOWO, HOWO A7, STEYR and so on.