We have taken the guess work out of getting the plumbing together for your filters or sumps. Everything is included to hook up the great Oase German pump to your filter and most reef ready aquariums. A King Brothers check valve is also included to prevent back siphoning when the power is off. The plumbing included provides easy installation with optimized performance for the filter models listed. Optional items that may be needed PVC Glue, aquarium drain and fitting adapters. (This varies with some manufactures.) Let us know and we can make sure you have what you need.