These Conversion Adapters are required if upgrading from 1000gph or smaller Intex pump system to 1500gph or LARGER Intex pump system.**Please note this is the only item you will need when upgrading your pool pump system****If your new pump system did not come with 2 hose and nuts, 2 plunger valves, and 2 strainers, you will need to contact the company you purchased your pump system from as there are several sellers that will take parts out and resell them to make more money**