Description
Forespar MF 840 Vented Loop 1-1/2" | Boat Supply Store
Prevent unwanted fluid siphoning in critical marine systems with this specifically engineered vented loop. Its Marelon construction guarantees superior corrosion resistance, essential for saltwater or brackish environments like those found in Galveston Bay. Featuring a 1-1/2" barb size and a 5-1/4" height, this unit effectively introduces air into the system, breaking any siphon action that could lead to tank cross-contamination or engine damage.
Key Features
- Prevents siphoning from tank to tank
- Suitable for marine toilet and engine cooling systems
- Simple valve system allows air entry when not in use
- Molded in Marelon for corrosion resistance
- Duckbill one-way valve designed to seal with particulate matter
- Corrosion-proof construction for longevity
- Reliable siphoning prevention
- Easy installation
Specifications
| Product Specifications | |
|---|---|
| Barb Size | 1-1/2" |
| Height | 5-1/4" |
| Width | 7-3/4" |
| Material | Marelon |
| Valve Type | Duckbill |
Who This Is For
Boat owners and marine technicians requiring dependable siphoning prevention for onboard fluid transfer systems. This component is crucial for maintaining the integrity of marine toilet discharge lines and engine raw water intakes.
How It Compares
| Feature | Forespar MF 840 Vented Loop 1-1/2" | Groco BV |
|---|---|---|
| Barb Size | 1-1/2" | 1-1/2" |
| Material | Marelon | Bronze |
| Valve Type | Duckbill | Diaphragm |
| Height | 5-1/4" | 6-1/4" |
| Width | 7-3/4" | 7-1/2" |
Common Concerns Answered
How durable is the duckbill valve?
While designed to seal effectively even with minor debris, heavily fouled systems may occasionally present challenges. However, Marelon construction ensures the main body remains corrosion-free, a significant advantage over many metal alternatives.
Is Marelon as durable as metal?
Marelon offers superior corrosion resistance in marine environments, negating the common failure point of galvanic corrosion seen in metal fittings. Its impact resistance is also a key benefit for long-term marine use.
Will this corrode in my saltwater environment?
No, the Marelon construction is specifically chosen for its excellent corrosion resistance in harsh marine environments, ensuring a longer service life than many traditional metal components.
Frequently Asked Questions
What is a vented loop and why do I need one?
A vented loop is a safety device installed in a fluid line to break a siphon. It introduces air into the line when the pump or flow stops, preventing unwanted fluid transfer due to gravity, which is critical for preventing cross-contamination or accidental emptying of tanks.
Where are Forespar vented loops commonly used?
Forespar vented loops are commonly used in marine toilet discharge lines to prevent tank-to-tank siphoning and in engine raw water cooling systems to prevent back-siphoning when the engine is shut down.
What material is the Forespar MF 840 Vented Loop made from?
The Forespar MF 840 Vented Loop is constructed from Marelon, a high-strength, UV-stable polymer known for its exceptional corrosion resistance in marine applications.
How does the duckbill valve in this vented loop work?
The duckbill valve is a one-way valve made of flexible material. Under normal flow, the pressure pushes the valve open. When flow stops, the valve closes, and if a siphon tries to form, it pulls air through small openings in the loop, breaking the siphon. The design allows it to seal even with small particulate matter present.
What are the dimensions of the Forespar MF 840 Vented Loop?
The Forespar MF 840 Vented Loop has a barb size of 1-1/2 inches, a height of 5-1/4 inches, and a width of 7-3/4 inches.
