Replacement DXD 310B pump which is used for hot tubs, pools and whirlpool baths.The pump comes with two white union connectors (measurements below), which can be seen in product images.DXD 310 B Technical InformationDiameter of the Female Pump Union Connector That Connects to the Water Pump: 55.5mm / 2.185" inches (2 and 3/16" inches)Diameter of the Two Threaded Connectors on the Pump: 62.5mm / 2.46" inches (2 and 29/64" inches)Horse Power (HP): 0.75Power: 0.55 kW (or 750 watts)Volts: 230V / 50 HzProtection Grade: IP 55Maximum Lift (i.e. the maximum height the pump can pump water to): 8.0mGross Weight: 6.5 kgPump Union Connector: 2 1/2" inch to 2" inch connector (click here to see further information on this pump union)