attwoodmarine.com WATER SYSTEMS & VENTILATION 28 Stainless Steel Thru-Hulls & Scupper Valve Fittings Polish your image with these beautiful, durable stainless steel fittings. Each Thru-Hull and Scupper Valve is available with a new silicone gasket and are backed by Attwood’s trusted Lifetime Warranty! Why specify plastic parts when these fittings will last the life of the boat? Rugged Stainless Construction • Cast from certified Enhanced 316 Stainless Steel alloy for strength and lifetime corrosion-resistance • We polish all visible areas to a mirror finish, then passivate each part for additional protection • Thick steel sidewalls withstand continual stress and hose flexing Faster, Simpler Installation • A channel under the flange holds a bead of sealant, making it easier to apply a trouble-free seal • All models have wrench flats or an end notch to hold as a gripping surface. One installer can tighten all connections from inside the hull • Barbed tail ends provide plenty of room to hold multiple clamps Stainless Steel Straight Thru-Hulls, Barbed • Standard Thread model has full-length thread for thick hulls and easy tightening • Short Thread is a more compact size. Allows installation near corners and in confined areas. Caution: Stainless Steel Scupper Valves are designed for installation above the water line only. A Hose Size B Flange Dia. C Thread O.D. D Thread Length E Barb Length F Total Length Install. Hole Saw Size Thread NPSM Max Hull Thick. OEM Part # without Gasket Part # Short Length 5/8" I.D. 1-7/8" 1" 1" 1" 2-1/4" 1-1/8" 3/4" 5/8" 66540-1 66540-3 3/4" I.D. 1-7/8" 1" 1" 1" 2-1/2" 1-1/8" 3/4" 5/8" 66541-1 66541-3 1" I.D. 2-1/4" 1-3/8" 1-1/8" 1" 2-1/2" 1-1/2" 1" 5/8" 66542-1 66542-3 1-1/8" I.D. 2-1/4" 1-3/8" 1-1/4" 1" 2-1/2" 1-1/2" 1" 5/8" 66543-1 66543-3 1-1/4" I.D. 2-1/4" 1-5/8" 1-1/4" 1" 2-5/8" 1-3/4" 1-1/4" 5/8" 66544-1 66544-3 1-1/2" I.D. 3" 1-7/8" 1-1/4" 1-1/2" 3-1/8" 2" 1-1/2" 5/8" 66545-1 66545-3 Standard Length 5/8" I.D. 1-7/8" 1" 2" 1-1/4" 3-3/4" 1-1/8" 3/4" 1-1/16" 66546-1 66546-3 3/4" I.D. 1-7/8" 1" 2" 1-1/4" 3-3/4" 1-1/8" 3/4" 1-5/8" 66547-1 66547-3 1" I.D. 2-1/4" 1-3/8" 2-1/4" 1-1/4" 3-7/8" 1-1/2" 1" 1-3/4" 66548-1 66548-3 1-1/8" I.D. 2-1/4" 1-3/8" 2-3/8" 1-1/4" 3-7/8" 1-1/4" 1" 1-3/4" 66549-1 66549-3 1-1/4" I.D. 2-1/4" 1-5/8" 2-1/2" 1-1/4" 4-1/4" 1-3/4" 1-1/4" 1-7/8" 66550-1 66550-3 1-1/2" I.D. 3" 1-7/8" 2-1/2" 1-1/4" 4-1/8" 2" 1-1/2" 1-7/8" 66551-1 66551-3 2" I.D. 3" 2-3/8" 2-1/2" 1-3/4" 4-5/8" 2-1/2" 1-1/2" 2" 66552-1 — 66540G 66542 66546G 66548 Dia. B A B C D E F B D Dia. B F E C A Short Length Standard Length
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