Description
Attwood 3/4" Stainless Thru-Hull Fitting | Boat Supply Store
Engineered for above-waterline applications where durability and corrosion resistance are paramount, this Attwood thru-hull fitting ensures a secure and lasting connection. Its Enhanced 316 Stainless Steel construction provides exceptional strength and longevity, capable of withstanding the rigors of saltwater environments and continual hose flexing. With a 3/4" inner diameter hose size and a 1-7/8" flange diameter, it is designed for installations with a maximum hull thickness of 5/8".
Key Features
- Enhanced 316 Stainless Steel construction offers superior strength and lifetime corrosion resistance.
- Mirror Polish Finish provides a premium aesthetic and added protection against the elements.
- Passivation Treatment further enhances surface integrity and corrosion defense.
- Thick Sidewalls are engineered to endure constant stress and hose movement without compromise.
- Integrated Sealant Channel under the flange simplifies installation and ensures a reliable, watertight seal.
- Wrench Flats facilitate easy and secure tightening from within the vessel's hull.
- Ample Barb Length provides secure engagement for multiple hose clamps, preventing slippage.
- Short Thread Design is ideal for installations in tight spaces and near bulkheads or corners.
Specifications
| Product Specifications | |
|---|---|
| Inner Diameter Hose Size | 3/4" |
| Flange Diameter | 1-7/8" |
| Thread O.D. | 1" |
| Thread Length | 1" |
| Barb Length | 1" |
| Total Length | 2-1/2" |
| Install Hole Saw Size | 1-1/8" |
| Thread Type | 3/4" NPSM |
| Max Hull Thickness | 5/8" |
| Material | Enhanced 316 Stainless Steel |
Who This Is For
Boat owners and marine professionals requiring robust, corrosion-proof thru-hull fittings for above-waterline systems. It is particularly beneficial for builders and repairers working with limited space or complex hull configurations.
How It Compares
| Feature | Attwood 3/4" Stainless Thru-Hull Fitting | Bronze |
|---|---|---|
| Material | Enhanced 316 Stainless Steel | Chrome-plated brass, Bronze |
| Corrosion Resistance | Lifetime Corrosion-Resistance (316 Stainless Steel) | Good (Chrome-plated brass), Very Good |
| Hose Size (Inner Diameter) | 3/4" | 3/4", 3/4" |
| Flange Diameter | 1-7/8" | 1-7/8", 1-7/8" |
| Thread Size | 3/4" NPSM | 3/4" NPSM, 3/4" NPSM |
| Installation Feature | Wrench flats for internal tightening | Hex nut for external tightening, Hex nut for external tightening |
Common Concerns Answered
Is the price higher than other options?
While the initial investment for Enhanced 316 Stainless Steel may exceed that of plastic or brass, its superior corrosion resistance and lifetime durability offer significant long-term value, preventing premature replacement and potential costly repairs.
How do I ensure a watertight seal?
A reliable seal is achieved through proper hull preparation and the application of marine-grade sealant within the integrated channel beneath the flange, a standard procedure for all thru-hull fittings to prevent water intrusion.
Why is stainless steel preferred over brass or chrome-plated brass?
Enhanced 316 Stainless Steel offers unparalleled resistance to galvanic corrosion and pitting in harsh marine environments, ensuring consistent performance and structural integrity over the lifespan of the vessel, unlike brass or chrome-plated brass which can degrade over time.
Frequently Asked Questions
What is the maximum hull thickness this thru-hull fitting can accommodate?
This thru-hull fitting is designed to accommodate a maximum hull thickness of 5/8 inches.
Is this thru-hull fitting suitable for use below the waterline?
No, this thru-hull fitting is explicitly designed and rated for above-waterline applications only.
What type of hose clamp is recommended for this barbed fitting?
For a secure connection on the 3/4" barb, we recommend using two robust marine-grade hose clamps, such as double-worm gear clamps, spaced adequately to prevent hose slippage under pressure.
What is the thread size of this thru-hull fitting?
The thread size of this thru-hull fitting is 3/4" NPSM (National Pipe Straight Mechanical).
What is the flange diameter of this thru-hull fitting?
The flange diameter of this Attwood thru-hull fitting measures 1-7/8 inches.
