8.94. A swing joint connected during construction work on rigid non-metallic underground piping must have a 90 ° elbow that can be connected to the petroleum product extraction system, a 1.5 metre-long non-metallic nipple connected to another 90 ° elbow in turn connected to non-metallic piping at least 1.5 m in length, installed respecting that sequence.
That type of swing joint may not be connected at the base of a dispenser.