Semi-Trash Water Pump ONLY - For Straight Keyed Shafts, 3in. Ports, 14,265 GPH FCD45 cast iron impeller and volute reduce vibration and last longer for semi-trash operations Silicon carbide seals are 2 times harder, 15% tougher, and 50% stronger than common aluminum oxide seals Durable cast iron impeller and volute Uses standard NPT threads for attachment flexibility Utilizes a check valve to hold a prime while the pump is not running