Description
Attwood 1-1/8" SS Thru-Hull Fitting | Boat Supply Store
Secure your vessel's plumbing with this corrosion-resistant thru-hull fitting, engineered for reliable above-waterline applications. Constructed from certified Enhanced 316 Stainless Steel, it boasts a 2-1/4" flange diameter and a 1-1/8" inner diameter hose barb designed for robust connections. Ideal for a variety of recreational and commercial vessels navigating coastal waters or the Gulf, this fitting ensures longevity and a professional finish.
Key Features
- Lifetime Corrosion Resistance from certified Enhanced 316 Stainless Steel alloy.
- Superior Durability with thick steel sidewalls resisting stress and flexing.
- Exceptional Aesthetics featuring a mirror-polished and passivated finish.
- Secure Hose Connections via a barbed tail end accommodating multiple clamps.
- Versatile Installation with a standard, full-length thread for thicker hulls up to 1-3/4".
- Watertight Seal facilitated by an included new silicone gasket.
- Single-Installer Friendly with wrench flats or end notch for internal tightening.
- Reliable Performance specifically designed for above-waterline use.
Specifications
| Product Specifications | |
|---|---|
| Inner Diameter | 1-1/8" |
| Flange Diameter | 2-1/4" |
| Thread OD | 1-3/8" |
| Thread Length | 2-3/8" |
| Barb Length | 1-1/4" |
| Total Length | 3-7/8" |
| Install Hole Saw | 1-1/4" |
| Thread Size | 1" NPSM |
| Maximum Hull Thickness | 1-3/4" |
| Material | Enhanced 316 Stainless Steel |
| Installation Location | Above the water line only |
Who This Is For
Boat owners and marine professionals requiring durable, aesthetically pleasing thru-hull fittings for above-waterline installations. Prioritizes longevity and ease of integration into existing or new marine systems.
How It Compares
| Feature | Attwood 1-1/8" SS Thru-Hull Fitting | Competitor |
|---|---|---|
| Hose Size (Inner Diameter) | 1-1/8" | 1-1/8" |
| Material | Enhanced 316 Stainless Steel | Bronze, 316 Stainless Steel |
| Thread Size | 1" NPSM | — |
| Thread Length | 2-3/8" | 2-3/8", 1-3/4" |
| Max Hull Thickness | 1-3/4" | 1-3/4" |
| Finish | Mirror Polish & Passivated | Polished |
Common Concerns Answered
I have an older boat and need to replace a thru-hull. Is this fitting likely to match?
While this Attwood fitting uses standard NPSM threading, older installations may utilize non-standard dimensions, occasionally leading to difficulty finding exact replacements. However, its robust 316 stainless steel construction and common 1-1/8" hose size make it a strong candidate for many replacements where superior corrosion resistance is desired.
Why is this fitting more expensive than other options?
The higher price point is a direct reflection of its construction from certified Enhanced 316 Stainless Steel, which provides unparalleled lifetime corrosion resistance and superior durability compared to bronze or lower-grade stainless steel. This material investment ensures significantly longer service life and reduces the need for premature replacement, offering substantial long-term value.
Is this thru-hull suitable for below the waterline?
No, this Attwood thru-hull fitting is specifically designed and certified for above the water line installation only. Using it below the waterline would compromise its integrity and could lead to dangerous system failures.
Frequently Asked Questions
What is the inner diameter of this Attwood thru-hull fitting?
The inner diameter of this Attwood thru-hull fitting is 1-1/8 inches.
What is the maximum hull thickness this fitting can accommodate?
This fitting can accommodate a maximum hull thickness of 1-3/4 inches.
What is the thread size for this Attwood thru-hull fitting?
The thread size for this Attwood thru-hull fitting is 1" NPSM.
Is this fitting suitable for use below the waterline?
No, this fitting is designed and certified for above-waterline installations only.
What material is this Attwood thru-hull fitting made from?
This Attwood thru-hull fitting is constructed from certified Enhanced 316 Stainless Steel.
