In an HVAC system, motors typically turn the air conditioning fan blade and the furnace blower motor. Newer high efficient motors, such as X13 and ECM motors, have "end caps" that control the motor speeds. These can be removed and replaced separately. Partial List of Units that Use This Item.Hit Ctrl + F and enter your model number for a quick search! The item "US Motors Nidec Square Flange Pool Spa Pump Motor 3 HP 8-168888-07 8-177453-03" is in sale since Thursday, April 29, 2021. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Pools & Spas\Pool Equipment & Parts\Pool Pumps". The seller is "bluestang5" and is located in Louisville, Kentucky. This item can be shipped worldwide.