Attwood Stainless Steel Straight Thru-Hulls Barbed Manuel d'utilisation

Composants Attwood

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Stainless Steel Thru-Hulls
and Scupper Valve
Installation Instructions

66540 - 66557, 66576 - 66579 and 67550-67580 Series

SAVE THESE INSTRUCTIONS
Form Number 69373 Rev G

08-03

This product carries a limited Lifetime Warranty.
See www.attwoodmarine.com or Product Catalog for details.

WARNING:

Read all instructions carefully before installing and using this product. To
prevent injury, remove boat from water when installing this product and
before using 120V power tools.

The stainless steel Thru-Hull and Scupper Valve must be mounted above
the boat’s maximum water line as determined by the boat’s draft at the
maximum loading recommended by the boat manufacturer. On sailboats,
mount the thru-hull high enough on the center of the transom to be above
the water line at all times.

REQUIRED FOR INSTALLATION
• Expandable wrench (max. 2-1/2", 64mm)
• Hole saw (see chart for size)
• Cordless drill
• Polyurethane marine sealant

THRU-HULL INSTALLATION
Thru-Hull

Thread

Hose

Hole Saw

Max. Hull

Part Number

Length

I.D.

Size

Thickness

66540-1 Short

5/8"

I.D. 1-1/8"

5/8"

66546-1 Standard 5/8"

I.D. 1-1/8" 1-1/16"

66541-1 Short

3/4"

I.D. 1-1/8"

5/8"

66547-1 Standard 3/4"

I.D. 1-1/8" 1-5/8"

66542-1 Short

1"

I.D. 1-1/2"

5/8"

66548-1 Standard 1"

I.D. 1-1/2" 1-3/4"

66543-1 Short

1-1/8"

I.D.

1-1/2"

5/8"

66549-1 Standard 1-1/8"

I.D.

1-1/2" 1-3/4"

66544-1 Short

1-1/4"

I.D.

1-3/4"

5/8"

66550-1 Standard 1-1/4"

I.D.

1-3/4" 1-7/8"

66545-1 Short

1-1/2"

I.D. 2"

5/8"

66551-1 Standard 1-1/2"

I.D. 2"

1-7/8"

66552-1 Standard

2"

2-1/2"

2"

90° Thru-Hull
Part Number

66576-1 Standard 5/8"

I.D. 1-1/4" 1-1/16"

66577-1 Standard 3/4"

I.D. 1-1/4" 1-1/16"

66578-1 Standard 1"

I.D. 1-5/8" 1-1/4"

66579-1 Standard 1-1/8"

I.D.

1-5/8" 1-1/4"

Narrow-Flange Thru-Hull
Part Number

67555-1 Standard 5/8"

I.D. 1-5/16"

7/8"

67554-1 Standard 3/4"

I.D. 1-5/16"

3/4"

67556-1 Standard 1"

I.D. 1-5/16"

7/8"

67557-1 Standard 1-1/8"

I.D.

1-5/16"

3/4"

67551-1 Standard 1-1/2"

I.D. 2"

1"

2-1/2"

67558-1 Long

3/4"

I.D. 1-5/16"

(min.1-9/16")

2-1/2"

67562-1 Long

1-1/2"

I.D.

1-15/16"

(min.1-9/16")

2-1/2"

67561-1 Long

1-1/8"

I.D.

1-5/16"

(min.1-9/16")

Mount Thru-Hull in the transom or side of hull, at least 12" (305mm) above
maximum water line. If possible, place fi tting on the same side as the
steering wheel so the driver can see discharge of water when the pump
is working properly.

1. Use a hole saw (see chart above for size – check against thru-hull) to

cut hole in the transom or hull. (See Figure 1)

Figure 1

Hose
Clamps

Maximum
Water Line

Marine Sealant

Thru-Hull
(standard thread)

See Chart for
Hole Saw Size

Shaft Wrench Fitting

Hose at Upward Angle

Notch for
Tightening

Thru-Hull
(short thread)

© 2008 Attwood Corporation
1016 N. Monroe Street, Lowell, MI 49331-0260 www.attwoodmarine.com

2. Remove tightening nut. Apply a small bead of marine sealant in the

groove under the Thru-Hull fl ange.

3. Place Thru-Hull into the hole. After this point, all connections may be

made from inside the hull.

4. Place tightening nut onto threads, with wide side toward hull. Tighten

fi rmly, but do not damage gelcoat by overtightening. To prevent turning,
grip the Shaft Wrench Fitting (on Standard Thread models) or the
Notched End (on Short Thread models).

5. Lead hose from bilge pump to Thru-Hull at an upward angle. Fasten

tightly at both ends with hose clamps.

SCUPPER VALVE INSTALLATION
Scupper Valve Thread

Hose

Hole Saw

Max. Hull

Part Number

Length

I.D.

Size

Thickness

66557-1 Short

1-1/2"

I.D. 2"

1-7/8"

66553-1 Standard 1-1/2"

I.D. 2"

3"

66555-1 Standard 2"

I.D. 2-1/2"

2"

67553-1 Standard

1-1/2"

I.D.

2-1/8" 2-3/4"

67581-1 Standard 1-1/2" 2-3/8" 1-1/8"

67580-1 Standard

2"

2-3/8" 1-1/8"

67583-1 Standard 2-1/2" 3-5/8" 1-1/2"

67582-1 Standard

3"

3-5/8" 1-1/2"

The Attwood Stainless Steel Scupper Valve is designed for boats with a
self-bailing cockpit. The fl apper valve opens outward to allow water to exit
and automatically closes to help prevent backwash from entering the cockpit.
Mount Scupper in the transom at least 12" (305mm) above maximum
water line.

1. Use a hole saw (see chart above for size - check against scupper) to

cut hole in the transom or hull. (See Figure 2.)

2. Remove tightening nut. Apply a small bead of marine sealant in the

groove under the Scupper fl ange.

3. Place Scupper Valve into the hole. After this point, all connections may

be made from inside the hull.

4. Place tightening nut onto threads, with wide side toward hull. Tighten

fi rmly, but do not damage gelcoat by overtightening. To prevent turning,
grip the Shaft Wrench Fitting with an expandable wrench.

5. Lead hose (see chart above for size) from cockpit to Scupper at a

downward angle. Fasten tightly at both ends with hose clamps.

Cockpit

Cockpit Drain (#3882-1)

Hose
Clamps

Scupper Valve

At Least
12" Above
Maximum
Water Line

Marine Sealant

Shaft Wrench Fitting

See Chart
Hole Saw Size

Hose

Figure 2

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