DMJ-172 5 1 230 28 8 2-1/2”: Cast Iron Self-Priming Centrifugal Commercial Pool Pump - D Series™- Especially designed for commercial and public swimming pools and spas, aquatic facilities, water parks and fountain applications where high performance and self-priming characteristics are desired. These self-priming, high performance pumps are available in high head and medium head models, providing a complete range of performance characteristics. Motors are open drip-proof, continuous duty rated 3450 RPM. Certifications - The D Series™ models are certified to meet the requirements of NSF Std. 50 with strainers installed. Pump models DO NOT include hair and lint trap.