Fleyenda Double Union Pneumatic PVC Ball Valve DN15 to DN200(1/2″ to 8″), Valve material: PVC/CPVC/PPG/PPHABS, Double union connection. Easy maintenance without cutting pipes. PVC (Polyvinyl Chloride) is excellent corrosion resistance. This design feature reduces friction and turbulence, allowing for efficient flow and minimizing the risk of pressure drops.