... 1.Only produce mould 2.describe:union ball valve 3.type:single,double,thread,butterfly,brass ball 4.material: ppr, pvc,abs,pp ... have more than 15 years experience about making double ball valve moulds.union ball valve has seven parts.We can make all kinds ... valves, membrane valves, bottom valves, gate valves, locking valves, deflation valves, IBC valve, three way valve, water tapes, etc., made of ABS, ...