3" male camlock X 2" female pipe trash pump adapter 3020A. This is an aluminum 3" male camlock X 2" female pipe aka cam and groove adapter. This camlock is used to adapt any trash pump or water suction discharge hose with a 2" female camlock to a 3" trash pump or sump pump. This camlock is great for construction, home use, or rental yard. Now you can use two different size hose with the same trash pump or sump pump.