The Float Valve

The float valve controls the flow of water into the sump.  It is made of polypropylene with a stainless steel locking bolt and wing nut.  We ship an optional nylon bolt and nut with each unit in case you are uncomfortable using stainless steel in your aquarium.  I prefer the stainless steel since it is stronger and doesn't noticeably corrode in contact with saltwater.  Either option works just fine.  The float can be swiveled to point in different directions to allow for obstructions in your sump.  By loosening the wing nut, the float can be adjusted up or down depending on your needs.  The water line connects to the float with a compression nut.  The unit comes fully assembled out of the box.

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Polypropylene float valve.  To the left is the float switch uses solely for safety backup.