Pump parts and accessories are components and devices used in the construction of pumps. A pump part may include an upstream and downstream bend element, sidestream, inlet guide vane, impeller, front and rear seals, diffuser, and an exit element such as a volute. Pump parts and accessories vary by media pumped and application. For example, a heat pump part includes a reversing valve, two metering devices, and two bypass valves in order to move heat and provide air conditioning effects. A compressor pump accessory is a part that pumps the refrigerant to the reversing valve to provide cool air. A geothermal heat pump component can model the performance of a water-source heat pump, which transfers water to the refrigerant and to the air heat.