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The Kunkle 337-K01, 3", Relief Valve is protection of low to medium pressure - high volume blowers, compressors, conveying systems and bulk haulingModel 337 is ASME Section VIII Air/Gas “UV” National Board Certified Safety Valve. manual testing. Each Kunkle valve is tested and inspected. A lift handle is provided for easy manual testing. Protects low to medium pressure blowers and compressors. It is well suited for positive displacement blowers. KUNKLE MODELS 215V/337 VACUUM RELIEF AND SAFETY VALVES. SAFETY AND RELIEF PRODUCTS manual testing. Each valve tested and inspected for pressure.