Is this an air cylinder？

　　Is this an air cylinder？Just changed, filter cotton

　　= (Xianglong Agricultural Group Fish Friends Review) =

　　Tianjin two son 1978

　　 Say

　　 The key can keep it.
Fish friend Jingjing grass

　　 Say

　　 should be no problem
Fish friend silk fish

　　 Say

　　 The just changed water is certainly not counted.
Fish friend Jingjing grass

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