This rigid "Class E PVCu Pipe" is commonly used in varying lengths as the suction wand (lance) attached to the toilet cleaning probe assemblies on portable toilet service vehicles and tankers.
With a 60mm OD and smooth 50mm ID it is typically attached to an isolating ball valve and vacuum pipework.
If your ball valve is fitted with weld end fittings, you can secure the suction lance to the ball valve using a suitable rigid PVC cement adhesive.
