BS EN 13244-4:2003 Plastics piping systems for buried and above-ground pressure systems for water for general purposes, drainage and sewerage - Polyethylene (PE) - Valves
2012BS EN 12201-4:2012 Plastics piping systems for water supply, and for drainage and sewerage under pressure. Polyethylene (PE). Valves
2003BS EN 13244-4:2003 Plastics piping systems for buried and above-ground pressure systems for water for general purposes, drainage and sewerage - Polyethylene (PE) - Valves