Downloads Please find a list of downloadable PDF's below: 4 Hole Distribution Box & Drop Box 7 Hole Distribution Box Ash Environmental - Products & Services Distributing Indexing Valves Drip Distribution Systems Drip Distribution Systems with soil loading rates Effluent Filter Screens Sludge Samplers Grinder Pumps Tank Risers, Lids and Watertight Seals Installation Guidelines for Domestic Pressure Pipe Networks EPA Research on Options for Low Permeability Subsoils Submersible Pumps Pumped Polishing Filters Drip Case Study 1: Latton School Drip Case Study 2: Housing Estate Drip Case Study 3: Tipperary School Drip Case Study 4: Single House, Kilkenny