TT15/30/60 Tank Top filters are designed for industrial service. Aluminum casting and Buna-N seals standard. For use with mineral and synthetic based fluids. These return filters conveniently mount to tank tops with four screws. Common holes are used to mount the filter head to the reservoir without welding. A down pipe is attached to a threaded port and the gasket surface provides a watertight seal. Each element provides a new bypass valve and anti-drain back valve for easy element change.