... its unique design and the craft, it is widely used in US, Canada, America, South America, Africa, Australia, Europe and China. ... coupler With the preheating installment the asphalt to pump fixed in 400GPM (a gallon/minute), effectively prevent against the coagulation, ... The Lufeng company has been granted the Quality System Certificate in conformity with ISO 9001:2000 and has passed China Compulsory ...