... raw material 3.affordable Watsun is a leading manufacturer of filters in China. It was founded in 1990, and ... company in HongKong,Singapore,Australia and all over China.Our filters are mainly used for trucks (VOLVO, SCANIA, IVECO, RENUALT ... engineering machinery( Caterpillar, HITACHI, KOMATSU, HINO, MITSUBISHI, ETC.) Our filters are largely export to Germany, Spain, France, Australia, Poland, Russia ...