Thru-Hull Flanged 25 mm (1 in) with 19 mm Barb | 4BoatsChrome plated flanged through hull fitting with 25 mm (1 in) bore and 19 mm (3 4 in) hose barb for direct hull penetration and secure hose connection. Design: flanged through hull for hose connection Bore: 25 mm (1 in) for standard plumbing Hose barb: 19 mm (3 4 in) for flexible hose attachment Flange: seals to hull Finish: chrome plated for surface protection Verify hose ID and hull thickness for fit