CPR filters are designed for long term reliability and ease of operation. Easily fits under your aquarium with its compct size. Has simple installation and operation, uses an efficient drip plate or drip lid dispersal. Has specially designed vented lids to allow for proper gas exchange, and will not warp. CR 900 handles up to 125 gallons. Inlet 1" bulk head. 21" L x 10" W x 15.5" H.