Air-Operated Double Diaphragm Pump Cast Iron Construction & Nitrile Diaphragm & 3 GPM Flow Rate Our self-priming diaphragm pump features an all-bolted cast iron body and double nitrile diaphragms, sturdy and corrosion-proof, without leakage. Sealed ball valves and non-stall operation provides outstanding performance. It is perfect for transferring viscous and flammable fluids. Our top of the line self-priming diaphragm pump will ensure your operations are flowing smoothly. Premium Double Nitrile Diaphragms Excellent Air-operated Performance Unique & Professional Designs Key Features Premium Double Nitrile Diaphragms: Our air-operated double diaphragm pump adopts nitrile diaphragms, durable, corrosion-proof, and long-lasting. Max. Temperature: 150 ℉/66 ℃; Max. Pressure: 90 psi; Max. Flow Rate: 3 GPM; Max Head Lift：196.85 ft/60 m±15%. Sturdy & Leak-proof Construction: The diaphragm pump housing is made of cast iron material, bolted against leakage, sturdy, and corrosion-proof for