1) uPVC pipes and fittings shall comply with the relevant British Standard stated in Table 5.1.(2) uPVC pipes and fittings above ground shall have solvent welded spigot and socket joints. uPVC pipes and fittings below ground shall have either solvent welded spigot and socket joints or flexible spigot and socket joints with elastomeric joint rings as stated in the Contract.(3) Fittings Amd 1/2019 for uPVC pressure pipes complying with BS 3506 shall comply with the following:uPVC pipes and fittings 5.15 Injection moulded uPVC fittings for solvent welding Amd 1/2019Fittings for uPVC pressure pipes(5) The Class of uPVC pressure pipes complying with BS 3506 shall depend on the pressure rating.