Forespar Performance Products MF 840 Vented Loop Review

Let’s Talk About Forespar Performance Products MF 840 Vented Loop

The Forespar Performance Products MF 840 Vented Loop is a crucial component often overlooked but incredibly important in marine systems. Designed by Forespar Performance Products, this seemingly simple device prevents siphoning in hoses, most commonly in toilet and engine cooling systems. Its construction from Marelon, a corrosion-proof polymer, combined with a reliable duckbill valve makes it a worthwhile investment for any boat owner.

I came to this product because of a recurring issue with my boat’s head. The sanitation hose was experiencing backflow, causing unpleasant odors and potential contamination. I specifically sought out a vented loop to eliminate this siphoning problem and ensure a cleaner and more hygienic marine environment.

Upon unboxing, the MF 840 Vented Loop felt solid and well-made. The Marelon material felt durable and resistant to the harsh marine environment, and the duckbill valve seemed robust. It was lighter than I expected, which is a definite plus for a component that will be installed in a potentially cramped space.

Compared to other vented loops I’ve seen (mostly brass or stainless steel), the Marelon construction of the Forespar loop immediately stood out. I picked this over the metal alternatives primarily because of its corrosion resistance, a critical factor in saltwater applications. I also considered a similar product from another manufacturer, but the Forespar’s reputation for quality and the well-designed duckbill valve swayed my decision.

My first impression was positive. I was relieved to finally have a solution that promised to address the siphoning issue effectively and durably. It felt like a smart, proactive solution to a common boating problem.

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Real-World Testing: Putting Forespar Performance Products MF 840 Vented Loop to the Test

First Use Experience

I installed the Forespar Performance Products MF 840 Vented Loop in my boat’s sanitation line, following the manufacturer’s instructions. The installation was straightforward, requiring only basic plumbing skills and tools. The loop was placed as high as possible in the hose run to maximize its effectiveness in preventing siphoning.

I tested it immediately by flushing the toilet several times, both in calm harbor conditions and while underway in choppy seas. The loop performed flawlessly, effectively breaking the siphon and preventing backflow. No leaks were detected at the hose connections.

The loop required no special adjustment or maintenance after installation, which was a great relief. There were no surprises; the product worked exactly as advertised.

Extended Use & Reliability

After several months of use, the Forespar Performance Products MF 840 Vented Loop continues to perform reliably. There are no signs of wear or degradation, even after exposure to saltwater and regular use of the boat’s head.

The Marelon material remains in excellent condition, showing no signs of corrosion or discoloration. The duckbill valve appears to be functioning perfectly, effectively sealing when necessary and allowing air to enter the line when not in use.

Maintenance has been minimal; I simply inspect the loop periodically for any signs of debris or damage. The Forespar loop has significantly outperformed my expectations, resolving the siphoning issue completely and providing peace of mind.

Breaking Down the Features of Forespar Performance Products MF 840 Vented Loop

Specifications

• Material: Molded in Marelon, a high-strength, corrosion-resistant polymer. Marelon ensures the loop withstands the harsh marine environment without degrading or corroding.
• Hose Size: Designed for 1-1/2″ ID (inner diameter) hoses. This is a standard size for many marine sanitation and cooling systems.
• Valve Type: Duckbill one-way valve. The duckbill design allows for reliable sealing, even with particulate matter in the fluid.
• Color: Black. The black color blends in well with most marine plumbing systems.
• Function: Prevents siphoning in fluid lines. This prevents backflow from tanks, which maintains the hygiene and integrity of fluids.

These specifications are crucial because they directly impact the loop’s ability to perform its intended function in a marine environment. The corrosion resistance of Marelon ensures longevity, while the duckbill valve provides reliable siphon prevention.

Performance & Functionality

The Forespar Performance Products MF 840 Vented Loop excels at its primary job: preventing siphoning. The duckbill valve effectively seals when fluid pressure is present, preventing backflow. When the pressure is released, the valve opens, allowing air to enter the line and break the siphon.

Its strengths lie in its simplicity and reliability. There are no moving parts to fail (other than the duckbill valve), and the design is inherently robust. The only potential weakness is the possibility of the duckbill valve becoming clogged with debris, although the design is relatively resistant to this.

The product definitely meets and exceeds my expectations. I was initially skeptical that such a simple device could effectively solve the siphoning problem, but it has proven to be a reliable and effective solution.

Design & Ergonomics

The design of the Forespar Performance Products MF 840 Vented Loop is simple and functional. The molded Marelon body is lightweight and easy to handle, and the hose connections are designed for a secure and leak-free fit.

The loop is user-friendly; installation is straightforward, and no special tools or skills are required. The only potential issue is ensuring the loop is installed at the correct height above the waterline to maximize its effectiveness.

Durability & Maintenance

The Marelon construction ensures the Forespar Performance Products MF 840 Vented Loop is exceptionally durable. It is resistant to corrosion, UV damage, and impact, all of which are common in marine environments.

Maintenance is minimal; periodic inspection for debris or damage is all that is typically required. The duckbill valve can be replaced if necessary, although it is designed to be long-lasting.

Accessories and Customization Options

The Forespar Performance Products MF 840 Vented Loop is a self-contained unit and does not require any additional accessories for basic functionality. However, it’s wise to use high-quality hose clamps to ensure secure and leak-free connections.

No specific customization options are available, but the loop is compatible with standard 1-1/2″ marine hoses from various brands. You might choose different grades or types of hoses to suit your specific application or budget.

Pros and Cons of Forespar Performance Products MF 840 Vented Loop

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Who Should Buy Forespar Performance Products MF 840 Vented Loop?

The Forespar Performance Products MF 840 Vented Loop is perfect for boat owners who want to prevent siphoning in their marine toilet systems, engine cooling systems, or other fluid lines. It’s an essential component for anyone seeking to maintain a clean, hygienic, and reliable boating system.

Anyone renting a boat for short periods could skip buying this as the vented loop is already installed, or the responsibility is on the boat owner. If you are not comfortable working with plumbing or are unsure about proper installation, you may want to consider hiring a qualified marine technician.

Must-have accessories include high-quality marine-grade hose clamps of the correct size. It’s also a good idea to have spare duckbill valves on hand for future replacement, although they should last for several years under normal conditions.

Conclusion on Forespar Performance Products MF 840 Vented Loop

The Forespar Performance Products MF 840 Vented Loop is a simple, effective, and durable solution for preventing siphoning in marine fluid lines. Its Marelon construction ensures long-lasting corrosion resistance, and its duckbill valve provides reliable performance.

At a price of $43.19, the MF 840 Vented Loop represents excellent value. The cost is easily justified by the peace of mind it provides and the prevention of potential problems caused by siphoning.

I wholeheartedly recommend the Forespar Performance Products MF 840 Vented Loop to any boat owner looking for a reliable and low-maintenance siphon prevention solution. Don’t let backflow ruin your boating experience – invest in a Forespar loop today!