Jul 26, 2015 · HydroSpan 100 Enlarging Polymer. Report. Browse more videos. Playing next. 1:00. How to a enlarge a hole with a hole enlarging drill bit. Tag My Mind. 6:19.
Hydrodrain 400, 420, 700 and 990 are composite drainage products consisting of three-dimensional "dimple" type polyethylene core with a non-woven, filter fabric (Hydrodrain 400 and 420 are needle punched). There are several variations of this product to meet particular project requirements.