Polypropylene Self-Adjusting Head by ave | Oct 8, 2013 | Accessories, Oil Skimmer, Oil Skimmer Accessory/Replacement, Products, Replacement The Polypropylene Self-Adjusting Head is for use with the Dragonfly™ Micro Oil Skimmer. It is both inner and outer floats. Share:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)