The ATTWOOD Tsunami T500 Aerator Pumpwith their innovative engineering and compact design, delivers high output from a small package.Using the most advanced material available, including the best quality bearings and state-of-the-art brushes, alloys and magnets. Patented shaft seal prevents leaks caused by misalignmentplus caulked and tinned wiring eliminates wicking, prevents water damage and resists corrosion. 90 threaded hose-to-barb connector Motor cartridge locks for secure placement and unlocks for easy cleaning, maintenance and replacement Water-cooled housing reduces heat buildup to extend motor life Straight threaded hose-to-barb connector Engineered composite inlet and body withstand stresses associated with hull pounding and resist deteriorating effects of caulks Thread sizes accommodate standard filter screens, 3/4”-14 --NPSM thread on T500 aerator