Description
1-1/4" SS Combo Thru-Hull Fitting NPS/NPT | Boat Supply Store
For robust marine plumbing installations requiring superior corrosion resistance, this #316 stainless steel thru-hull fitting offers a unique NPSM/NPT combination thread. It ensures secure connections for a variety of marine hose and pipe fittings. This fitting is UL Listed 647B, signifying adherence to stringent safety and reliability standards, making it ideal for saltwater environments or bilge pump discharges on offshore fishing vessels.
Key Features
- Unmatched Versatility with NPSM / NPT combination thread
- Extreme Durability via premium #316 Stainless Steel construction
- Certified Reliability with UL Listed 647B designation
- Complete Installation Ready with included nut
- Corrosion Resistance for harsh marine environments
- Broad Size Availability from 1/2" to 3"
- Optimized for Plumbing connections
- Trusted Brand Quality from GROCO
Specifications
| Product Specifications | |
|---|---|
| Thread Type | NPSM / NPT Combination |
| Material | #316 Stainless Steel |
| Listing | UL Listed 647B |
| Size | 1-1/4" |
| Includes | Nut |
Who This Is For
Marine boat owners, builders, and maintenance professionals requiring a durable and versatile thru-hull fitting for plumbing applications. Ideal for those needing both NPSM and NPT thread compatibility in a corrosion-resistant stainless steel construction.
How It Compares
| Feature | 1-1/4" SS Combo Thru-Hull Fitting NPS/NPT | Perko 1 |
|---|---|---|
| Material | 316 Stainless Steel | Bronze, 304 Stainless Steel |
| Thread Type | NPSM / NPT Combination | NPT, NPT |
| Size | 1-1/4" | 1-1/4", 1-1/4" |
| UL Listed | Yes (647B) | No, No |
Common Concerns Answered
Will I have trouble finding adapters for the combo thread?
While the NPSM/NPT combination offers versatility, ensure your chosen hose adapters or fittings are compatible. Standard NPSM and NPT fittings can often be used, but verify thread pitch and sealing surfaces for a leak-free installation. This fitting is designed for direct use with either thread type where applicable.
Why is this fitting more expensive than brass or plastic options?
The premium price reflects the superior durability and corrosion resistance of #316 stainless steel, especially critical in harsh marine environments. Its UL listing and specialized combo thread also add to its value and performance benefits over basic materials.
Is this fitting suitable for all boat types?
This fitting is engineered for durability and corrosion resistance, making it exceptionally well-suited for saltwater applications, offshore fishing boats, and commercial vessels where material integrity is paramount. Its versatility benefits any boater requiring reliable plumbing.
Frequently Asked Questions
What is the thread type of the GROCO TH-1250-WS?
The GROCO TH-1250-WS features a unique combination thread, accommodating both NPSM (National Pipe Straight Mechanical) and NPT (National Pipe Taper) fittings.
What material is the GROCO TH-1250-WS made from?
This thru-hull fitting is constructed from high-grade #316 stainless steel, renowned for its exceptional resistance to corrosion and pitting in marine environments.
What is the size of the GROCO TH-1250-WS thru-hull fitting?
The GROCO TH-1250-WS is a 1-1/4" size fitting.
Is the GROCO TH-1250-WS UL listed?
Yes, the GROCO TH-1250-WS is UL Listed under number 647B, ensuring it meets established safety and performance standards.
What are the NPSM and NPT threads used for on this fitting?
The NPSM portion is a straight thread used for mechanical connections, often with a gasket or O-ring for sealing. The NPT portion is a tapered thread that creates a seal by drawing the fitting tighter into its mating part, commonly used for pipe connections.
