HD bilge engineered with a tall stack heavy duty 12 pole hermetically welded motor, double ball bearing design, mechanical seal and 3/16th stainless steel shaft. Prewired with a Completely Sealed Compact Mechanical Electro-Magnetic Switch1 1/8" & 1 ¼" Internally Threaded PortsRemovable Check ValveMolded T-Bracket BaseBest Motor Performance and Longevity With Less Noise and VibrationBetter Rotor Support With Less Rotor DeflationLess Prone to Scoring and Shaft DamageAssured Waterproof and TightnessLess Amp Draw Than Similar Options3 year warranty