This is the complete one speed 115vac motor with impeller for a Grundfos 15-42 pump. This can be used with a F (cast iron) or BF (bronze) volute. This is actually the simplest route to take if you have an existing pump that has failed. There are 4 allen head screws holding the pump motor. This new motor has a new gasket and screws if you need them. Don't forget to isolate the existing pump water pressure and electrical supply before proceeding with the replacement. This pump was new in the box but one of the flange bolt tabs was broken which is actually your good fortune because now it is lighter and shipping is less. I tested it with 115 vac and it operated as it should.