Carf-Models Chengdu J-10 Instruction Manual page 21

Installa(on*of*smoke*injector*tubes*(op(onal)***
Use&4&mm&brass&tubes&and&aRach&as&suggested&on&the&photos&above.&
SoDen&them&if&necessary&by&glowing&with&a&torch.&Make&sure&they&to&not&
restrict&the&movement&of&the&vector&tube&in&any&way.&&