... is composed of areation membrane EPDM or Colicone, liner tube& manifold UPVC, stainless steel fastener The Hanging Tube Aerator Also called ... ,is composed of aeration membrane EPDM or Colicone, liner pipe & manifold UPVC or ABS, stainless steel fastener, etc. It can be ... bring out fine bubbles. the steel rod/ concretes inside the manifold, ensures stable running of the tube areator from flotating up ...