Kinetic Air and Vacuum Relief 40 mm (1 1/2")TWSS Kinetic Air and Vacuum Relief 40 mm (1 ) is applied to pipeline networks. It evacuates air during pipeline filling and enables air intake in the event of pipeline draining. Simple Operation Sealing Pressure of 5 PSI Maximum pressure of 150 PSI Air Out Take Flow of 0 330 M3 H at 0 5 PSI Air Intake Flow of 330 0 M3 H at 5 0 PSI BSP Thread 40 mm (1 ) UV Resistant SKU AV0232B Specifications If Measuring your Thread with a Tape or Ruler 1 40mm BSP =