Soval 1036-025 The 2-1/2" Cast Iron Wafer Silent Check Valve is the only cast iron wafer silent check valve you need for your waterworks, well water, irrigation, sewage, industrial and plumbing flow control needs. High quality build, long lasting performance and great customer service is what has kept in business for over 50 years and we look forward to serving you into the far future for all your flow control project needs.