The AquaFX Nano Media Reactor is an innovative "small" reactor, that does a BIG job. Complete with regulating valve, this unit can be used with a variety of pumps. Made with our Quick Connect fittings for easy customizing. 2 mounting brackets are included. It also comes with 2 feet of 3/8 inch tubing. This reactor will hold approximately 1/2 cup of GFO, and about a cup of Carbon.