These stub flanges are manufactured from PVC-U, and are Metric plain solvent weld. These fittings are WRAS approved and are resistant to most solutions of acid, alkalis, salts and to solvents that can be mixed with water.
These fitting have a maximum working temperature of 60°C with working pressure of 15 bar 20mm to 6" and 9 bar 8".
Metric fittings are manufactured to EN 1452-3, BS 4346 Part 1.
You will need backing rings to go with these fittings