NF P16-260-4:2001 Wastewater lifting plants for buildings and sites - Principles of construction and testing - Part 4 : non-return valves for faecal-free wastewater and wastewater containing faecal matter.
2001NF P16-260-4:2001 Wastewater lifting plants for buildings and sites - Principles of construction and testing - Part 4 : non-return valves for faecal-free wastewater and wastewater containing faecal matter.