attwoodmarine.com WATER SYSTEMS & VENTILATION 29 66577 66559 66558G 66557G 66565 D F Dia. B A E C B C B A F D E Dia. C A B C Stainless Steel Straight Thru-Hulls, Threaded • Unique multi-thread design with NPSM and NPT threads • Offer generous thread length • Allows for direct connection to seacocks or pipes Caution: Stainless Steel Thru-Hull Connectors are designed for installation above the water line only. A Flange Dia. B Thread O.D. C Total Length Installation Hole Saw Size Threads NPSM Max Hull Thickness OEM Part # without Gasket Part # 1-7/8" 2-1/8" 2-1/2" 1-1/8" 3/4" 1-5/8" 66559-1 — 2-1/4" 2-1/4" 2-5/8" 1-3/8" 1" 1-3/4" 66561-1 — 3" 2-3/8" 2-3/4" 2" 1-1/2" 1-7/8" 66563-1 — Stainless Steel Scupper Valves • The Scupper Flap is tough neoprene rubber with a molded V that fits into the grooved body to reduce backwash • Fasteners are concealed and corrosion-proof • Enhanced 316 Stainless Steel Alloy Caution: Stainless Steel Scupper Valves are designed for installation above the water line only. A Hose Size B Thread Dia. C Flange 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 # Threaded — 1-7/8" 3" 3-1/2" — 3-7/8" 2" 1-1/2" 3" 66565-1 — — 2-23/64" 3-5/8" 2-1/2" — 2-7/8" 2-1/2" 2" 2" 66567-1 — Barbed 1-1/2" 1-7/8" 3" 3-1/2" 1-1/2" 5-1/2" 2" 1-1/2" 3" 66553-1 66553-3 2" 2-23/64" 3-5/8" 2-1/2" 1-5/16" 4-1/2" 2-1/2" 2" 2" 66555-1 — 1-1/2" 3" 1-7/8" 2-1/4" 1-1/2" 4-1/2" 2" 1-1/2" 1-3/4" 66557-1 — Valve Accessories BULK Replacement Flappers for 1-1/2" 66553Kit — Replacement Flappers for 2" 66555Kit — Stainless Steel 90° Thru-Hulls, Barbed Allows installation in especially tight spaces. Caution: Stainless Steel Thru-Hull Connectors 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 # 3/4" I.D. 1-7/8" 1" 1-1/2" 3/4" 3-3/8" 1-1/4" 3/4" 1-1/16" 66577-1 — 1-1/8" I.D. 2-1/4" 1-3/8" 1-7/8" 3/4" 4-3/8" 1-5/8" 1" 1-1/4" 66579-1 —
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