Designed to enable a 3/4" thru-hull passage thru a transom or livewell wall and to attach an aerator screen on the other side. Flange allows flush fit. No outside nut required. Threaded length: 1-3/4", overall length 4" Includes Thru-hull (THSM-1) and 641642 ( AS-1) wire mesh strainer. Fits 3/4" hose
