CPR filters are designed for long term reliability and ease of operation. Easily fit under your aquarium with its compact size. Simple installation and operation, has efficient drip plate or drip lid dispersal. Specially Designed vented lids allow proper gas exchange, will not warp. CR1000 handles up to 150 gallons. Inlet 1" bulk head - Outlet 3/4" bulk head. 20" L x 12" W x 15" H.