Rugged Swing Check Valve exceeds AWWA C508 standards. Features either Metal-to-Metal Seating or Resilient Seating using fully field replaceable seats reached via the oversized maintenance port on the top. Features ambidextrous shaft mounting, along with a standard 17-4 PH shaft. Series CVI is available with air or oil cushioning systems. Also, available in a fully rubber encapsulated disc and permanent metal to metal configurations.