... 1.Only produce mould 2.describe:union ball valve 3.type:single,double,thread,butterfly,brass ball 4.material: ppr, pvc,abs, ... more than 15 years experience about making double ball valve moulds.union ball valve has seven parts.We can make all kinds ... , JIS, socket, thread, order, quality, size, color, package, weigh, fast, long, excellent, chemical, pressure, traditional, easy clean, single , double, ...