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 allow for strength and
lifetime corrosion-resistance.
- We polish all visible areas to a mirror finish, then each part through a
passivation for additional protection
- Thick steel sidewalls withstand continual stress and hose flexing
Solid Silicone Gasket
- Gasket is dimensionally stable--will not deteriorate or shrink over time
- Excellent resistance to UV & weather-aging
- Watertight, fool-proof, one-piece seal
- Eliminates the need to form and apply sealant or caulk
- No moreChemicals, solvent-soaked rags,or cleanup
- More than pays for itself in saved labor and cleanup time
- Guaranteed good looks because the perfect fit and concealment is built in
the gasket
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
Caution: Thru-Hull connectors are designed for installation
above the water line only.
Lifetime Warranty
| 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. |
Bulk Without Gasket |
Bulk With Gasket |
Aftermarket Packaging* |
| Short Length |
| 5/8" I.D. |
1-7/8" |
1" |
1" |
1" |
2-1/4" |
1-1/8" |
3/4" |
5/8" |
66540-1 |
66540G1 |
66540-3 |
| 3/4" I.D. |
1-7/8" |
1" |
1" |
1" |
2-1/2" |
1-1/8" |
3/4" |
5/8" |
66541-1 |
66541G1 |
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 |
66542G1 |
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 |
66543G1 |
66543-3 |
| 1-1/4" I.D. |
2-3/4" |
1-5/8" |
1-1/4" |
1" |
2-5/8" |
1-3/4" |
1-1/4" |
5/8" |
66544-1 |
66544G1 |
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 |
66545G1 |
66545-3 |
| Standard Length |
| 5/8" I.D. |
1-7/8" |
1" |
1" |
1" |
2-1/4" |
1-1/8" |
3/4" |
1-1/16" |
66546-1 |
66546G1 |
66546-3 |
| 3/4" I.D. |
1-7/8" |
1" |
1" |
1" |
2-1/2" |
1-1/8" |
3/4" |
1-5/8" |
66547-1 |
66547G1 |
66547-3 |
| 1" I.D. |
2-1/4" |
1-3/8" |
1-1/8" |
1" |
2-1/2" |
1-1/2" |
1" |
1-3/4" |
66548-1 |
66548G1 |
66548-3 |
| 1-1/8" I.D. |
2-1/4" |
1-3/8" |
1-1/4" |
1" |
2-1/2" |
1-1/2" |
1" |
1-3/4" |
66549-1 |
66549G1 |
66549-3 |
| 1-1/4" I.D. |
2-3/4" |
1-5/8" |
1-1/4" |
1" |
2-5/8" |
1-3/4" |
1-1/4" |
1-7/8" |
66550-1 |
66550G1 |
66550-3 |
| 1-1/2" I.D. |
3" |
1-7/8" |
1-1/4" |
1-1/2" |
3-1/8" |
2" |
1-1/2" |
1-7/8" |
66551-1 |
66551G1 |
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 |
66552G1 |
- |
WARNING:
This product can expose you to chemicals including Di-n-hexyl Phthalate (DnHP)
which is known to the State of California to cause reproductive harm, and
Vinyl Chloride which is known to the State of California to cause cancer. For
more information go to 
