<prompt> Heimlich valve is used for drainage ofPneumothoraxHemothoraxEmphyemaMalignant plural effusion  <response>: The Heimlich valveflutter valveis a small one-way valve used for chest drainage that empties into a flexible collection device prevents return of gases or fluids into the pleural space.The heimlich valve is less than 13 cm long and facilitates patient ambulation. Reference:SRBs manual of surgery,5th edition,page no:1116. 