Measure it 1st, some brand can't use the mainstream CG200 parts...
"Individual" chinese bike mechanic likes these quality brand : 正洲 (VTC) -Taiwanese brand that made locally / 大东 (DDQM) -Based in Chongqing , many bike's stock valves are supplied by them...
Parts supplier in Guangzhou
DDQM :
http://item.taobao.com/item.htm?id=38679462803
Generic:
http://item.taobao.com/item.htm?id=38516771834