Description
Attwood 1" Stainless Thru-Hull Fitting | Boat Supply Store
For demanding marine applications requiring superior corrosion resistance above the waterline, this Attwood thru-hull fitting ensures long-term performance. Its construction from certified Enhanced 316 Stainless Steel, polished to a mirror finish and passivated, actively combats saltwater degradation. The 1" inner diameter barb accommodates standard marine hosing, and the fitting requires a 1-1/2" hole saw for installation through hulls up to 5/8" thick, making it suitable for bilge pump discharges or deck drains on saltwater vessels.
Key Features
- Corrosion Resistance with certified Enhanced 316 Stainless Steel alloy
- Premium Aesthetics via mirror-polished finish and passivation
- Exceptional Durability with thick steel sidewalls resisting stress
- Secure Sealing provided by the included new silicone gasket
- Simplified Installation using wrench flats for internal tightening
- Reliable Hose Connection with ample space for multiple hose clamps on the barb
- Space-Saving Design due to short thread length for confined areas
- Consistent Threading with NPSM 1" thread specification
Specifications
| Product Specifications | |
|---|---|
| Inner Diameter Hose Size | 1" |
| Flange Diameter | 2-1/4" |
| Thread OD | 1-3/8" |
| Thread Length | 1-1/8" |
| Barb Length | 1" |
| Total Length | 2-1/2" |
| Required Hole Saw Size | 1-1/2" |
| Maximum Hull Thickness | 5/8" |
| Installation Location | Above Waterline Only |
| Thread Type | NPSM 1" |
Who This Is For
Boat owners and marine professionals seeking a highly durable and corrosion-resistant thru-hull fitting for above-waterline applications. This product is for those who prioritize longevity and a premium aesthetic over lower-cost alternatives.
How It Compares
| Feature | Attwood 1" Stainless Thru-Hull Fitting | Competitor |
|---|---|---|
| Material | Enhanced 316 Stainless Steel | Bronze, Chrome-plated Brass |
| Hose Size (Inner Diameter) | 1" | 1-1/2", 1" |
| Thread Size | 1" NPSM | 1-1/2" NPSM, 1" NPSM |
| Finish | Mirror Polish & Passivated | Polished, Chrome-plated |
| Max Hull Thickness | 5/8" | 5/8", 3/4" |
| Installation Location | Above Waterline Only | Above Waterline Only, Above Waterline Only |
Common Concerns Answered
Is the higher price justified for this Attwood thru-hull fitting?
The premium price reflects the use of certified Enhanced 316 Stainless Steel, mirror-polished finish, and passivation, which provide superior, long-lasting corrosion resistance compared to plastic or lower-grade metal alternatives, especially in harsh marine environments.
Can I use this thru-hull fitting below the waterline?
No, this Attwood thru-hull fitting is strictly designed and rated for above-waterline installation only due to its specific construction and sealing capabilities.
What is the expected lifespan of this fitting compared to cheaper options?
Constructed with Enhanced 316 Stainless Steel and treated for maximum corrosion resistance, this fitting is engineered for a significantly longer service life in saltwater conditions than plastic or chrome-plated brass fittings.
Frequently Asked Questions
What is the maximum hull thickness for this Attwood thru-hull fitting?
The maximum hull thickness for this Attwood thru-hull fitting is 5/8".
Can this thru-hull fitting be installed below the waterline?
No, this thru-hull fitting is designed and intended for above the water line installation only.
What is the thread size of this Attwood thru-hull fitting?
The thread size of this Attwood thru-hull fitting is NPSM 1".
What size hole saw is needed to install this fitting?
A 1-1/2" hole saw is required to install this fitting.
What type of stainless steel is used in this Attwood fitting?
This Attwood fitting is constructed from certified Enhanced 316 Stainless Steel alloy.
