26 WATER SYSTEMS
attwoodmarine.com
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.
66540G
B
C
B
C
A
A
D
E
D E F
Dia. B
Dia. B
F
Short Length
Standard Length
66542
A Hose Size
B Flange Dia.
C Thread O.D.
D Thread Length
E Barb Length
F Total Length 2-1/4" 2-1/2" 2-1/2" 2-1/2" 2-5/8" 3-1/8" 3-3/4" 3-3/4" 3-7/8" 3-7/8" 4-1/4" 4-1/8" 4-5/8"
Install. Hole Saw Size
Max Hull Thick.
OEM Part # without Gasket
Thread NPSM
Part #
Short Length 5/8" I.D.
66540-1 66540-3 66541-1 66541-3 66542-1 66542-3 66543-1 66543-3 66544-1 66544-3 66545-1 66545-3
1-7/8" 1" 1-7/8" 1"
1" 1"
1" 1" 1" 1" 1"
1-1/8" 1-1/8" 1-1/2" 1-1/2" 1-3/4"
3/4" 3/4"
5/8" 5/8" 5/8" 5/8" 5/8" 5/8"
3/4" I.D.
1" I.D.
2-1/4" 1-3/8" 1-1/8"
1" 1"
1-1/8" I.D. 2-1/4" 1-3/8" 1-1/4" 1-1/4" I.D. 2-1/4" 1-5/8" 1-1/4"
1-1/4" 1-1/2"
1-1/2" I.D. 3"
1-7/8" 1-1/4"
1-1/2"
2"
66546G
Standard Length 5/8" I.D.
1-1/16" 66546-1 66546-3
1-7/8" 1" 1-7/8" 1"
2" 2"
1-1/4" 1-1/4" 1-1/4" 1-1/4" 1-1/4" 1-1/4" 1-3/4"
1-1/8" 1-1/8" 1-1/2" 1-1/4" 1-3/4"
3/4" 3/4"
66547-1 66547-3 66548-1 66548-3 66549-1 66549-3 66550-1 66550-3 66551-1 66551-3
3/4" I.D.
1-5/8" 1-3/4" 1-3/4" 1-7/8" 1-7/8"
1" I.D.
2-1/4" 1-3/8" 2-1/4"
1" 1"
1-1/8" I.D. 2-1/4" 1-3/8" 2-3/8" 1-1/4" I.D. 2-1/4" 1-5/8" 2-1/2"
1-1/4" 1-1/2" 1-1/2"
1-1/2" I.D. 3"
1-7/8" 2-1/2" 2-3/8" 2-1/2"
2"
66552-1
2" I.D.
3"
2-1/2"
2"
—
66548
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