Bronze or Cast Iron. For semi-commercial and commercial swimming pool and spa recirculation. Available in high head and medium head models, providing a complete range of performance characteristics. Available in 3 – 5 HP models with 2-1/2″ NPT suction and 2″ NPT discharge ports. (Non self-primer, requires flooded suction installation.) Motors are open drip-proof, continuous duty rated 3450 RPM.