The Soval 8" PVC Wafer Butterfly Valve - NSF is the only schedule 80, nsf pvc wafer butterfly 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 Soval in business for over 50 years and we look forward to serving you into the far future for all your flow control project needs.