EN 1277:1996 Plastics Piping Systems - Thermoplastics Piping Systems for Buried Non- Pressure Applications - Test Methods for Leaktightness of Elastomeric Sealing Ring Type Joints
2003EN 1277:2003 Plastics piping systems - Thermoplastics piping systems for buried non-pressure applications - Test methods for leaktightness of elastomeric sealing ring type joints
1996EN 1277:1996 Plastics Piping Systems - Thermoplastics Piping Systems for Buried Non- Pressure Applications - Test Methods for Leaktightness of Elastomeric Sealing Ring Type Joints