Description
Attwood 316 SS Thru-Hull 1-1/2" Straight Barbed | Boat Supply Store
Engineered for demanding marine environments, this Attwood thru-hull fitting addresses the critical need for robust, long-lasting connections in saltwater applications. Featuring Enhanced 316 Stainless Steel, it provides superior strength and lifetime corrosion resistance, essential for vessels operating on the Texas Intracoastal Waterway. With a substantial 3-inch flange diameter and a 1-1/2" NPSM thread, this fitting is designed for secure installation in hulls up to 1-7/8" thick, ensuring dependable performance for bilge pump discharge or baitwell plumbing.
Key Features
- Lifetime Corrosion Resistance via certified Enhanced 316 Stainless Steel alloy.
- Premium Aesthetic with mirror-polished and passivated finish on all visible surfaces.
- Structural Integrity built with thick steel sidewalls to endure constant stress and hose flex.
- Streamlined Installation utilizing an included silicone gasket for rapid, secure sealing.
- Simplified Sealant Application facilitated by an integrated channel under the flange to retain sealant.
- One-Person Tightening achievable with wrench flats or end notch for gripping.
- Secure Hose Attachment with barbed tail ends providing ample surface for multiple hose clamps.
- Versatile Fitment featuring full-length thread accommodating thick hulls and ensuring easy tightening.
Specifications
| Product Specifications | |
|---|---|
| Inner Diameter | 1-1/2" |
| Material | Enhanced 316 Stainless Steel |
| Flange Diameter | 3" |
| Thread O.D. | 1-7/8" |
| Thread Length | 2-1/2" |
| Barb Length | 1-1/4" |
| Total Length | 4-1/8" |
| Install Hole Saw Size | 2" |
| Thread Type | 1-1/2" NPSM |
| Max Hull Thickness | 1-7/8" |
| Installation Location | Above the waterline only |
Who This Is For
Boat owners and marine professionals requiring highly durable and corrosion-resistant thru-hull fittings for above-waterline applications. Ideal for those prioritizing longevity, a superior aesthetic, and ease of installation over lesser materials.
How It Compares
| Feature | Attwood 316 SS Thru-Hull 1-1/2" Straight Barbed | Perko 0499DP099A 1 |
|---|---|---|
| Material | Enhanced 316 Stainless Steel | Bronze, Bronze |
| Hose Size (Inner Diameter) | 1-1/2" | 1-1/2", 1-1/2" |
| Thread Size | 1-1/2" NPSM | 1-1/2" NPSM, 1-1/2" NPSM |
| Flange Diameter | 3" | — |
| Corrosion Resistance | Excellent | Good, Good |
Common Concerns Answered
Is this fitting suitable for below the waterline?
This Attwood thru-hull fitting is specifically designed and rated for above the waterline installation only. Utilizing it below the waterline may lead to premature corrosion and potential failure.
How does the sealant channel work?
The channel located directly beneath the flange is engineered to retain a bead of marine sealant, ensuring a consistent and reliable seal when the fitting is tightened against the hull. This feature simplifies the sealing process, reducing the likelihood of leaks.
What are the advantages of Enhanced 316 Stainless Steel over other materials like bronze?
Enhanced 316 Stainless Steel offers superior corrosion resistance, particularly in saltwater environments, and maintains its structural integrity and aesthetic appeal over a longer service life compared to bronze. This premium material is ideal for critical hull penetrations.
Frequently Asked Questions
What is the maximum hull thickness this thru-hull fitting can accommodate?
This Attwood thru-hull fitting can accommodate a maximum hull thickness of 1-7/8 inches.
Is this thru-hull fitting suitable for use below the waterline?
No, this thru-hull fitting is designed and rated for above the waterline installation only.
What type of stainless steel is used for this Attwood thru-hull fitting?
This Attwood thru-hull fitting is constructed from certified Enhanced 316 Stainless Steel alloy.
What is the recommended hole saw size for installing this fitting?
The recommended hole saw size for installing this thru-hull fitting is 2 inches.
How is the sealant applied for a trouble-free seal with this fitting?
A bead of marine-grade sealant should be applied to the channel located under the flange of the fitting before installation. This channel is specifically designed to hold the sealant, ensuring a consistent and effective seal against the hull.
