All stainless steel bolts to avoid corrosion problemsSpring loaded Viton shaft seal is used to prevent premature leaksOur proprietary rubber impeller compound allows longer dry running timeMacerator pump housing can be rotated in increments of 90 degrees to allow for left, right or top dischargeIncludes Waste Valve Assembly that isolates the waste matter from the pump during maintenance. This new features allows you to remove the pump without disconnecting plumbing.