Does the Marshall Excelsior MER470 Flow Longer Propane Kit Live Up to Its Name?
The pursuit of convenient and continuous fuel supply for smaller propane appliances often leads to compromises. This is precisely where the Marshall Excelsior MER470 Flow Longer Propane Kit steps in, aiming to bridge the gap between larger LP gas systems and those portable devices typically reliant on disposable cylinders. Marshall Excelsior, a name synonymous with quality propane fittings, has engineered this kit to offer a practical solution for RV owners, backyard enthusiasts, and cottage dwellers alike. It promises to eliminate the recurring expense and environmental impact of single-use canisters.
My own need for such a system arose from a persistent annoyance: the constant need to swap out small, 1lb propane bottles for my portable grill and a small heater during extended camping trips and backyard gatherings. It felt wasteful, and frankly, a hassle I’d rather avoid. The prospect of tapping into the main RV or backyard propane tank for these smaller appliances was an appealing one. Upon receiving the MER470 kit, my first impression was one of robust simplicity; the brass fittings felt substantial, and the hose, while not overly thick, exuded a sense of reliable durability. I had briefly considered looking into bulk propane adapters for the 1lb bottles themselves, but the idea of a direct integration felt cleaner and more elegant. My initial reaction was one of quiet satisfaction, a sense that this small kit might just solve a persistent, albeit minor, problem.
Real-World Testing: Putting Marshall Excelsior MER470 Flow Longer Propane Kit to the Test
First Use Experience
My initial testing grounds for the Marshall Excelsior kit were my own backyard patio and a weekend camping trip where I utilized my RV’s onboard propane. The setup was straightforward; connecting the brass tee to the RV’s main propane line required minimal effort, and attaching the hose to my small propane grill was equally uncomplicated. The real test, however, was seeing if it would maintain a consistent flow to my modest BTU appliances without interruption.
Under typical backyard conditions – the grill running for an hour or so, or the patio heater for a couple of hours – the kit performed admirably. There was no discernible drop in performance, and the propane supply felt as robust as if I were using a standard 20lb tank directly. During the camping trip, I connected it to a small propane-powered camp stove and a propane lantern. Again, the Marshall Excelsior MER470 Flow Longer Propane Kit delivered steady fuel. I experienced no issues with leaks or flow restriction, even when the ambient temperature dropped slightly overnight. It was impressively plug-and-play, with no complex adjustments or a steep learning curve.
Extended Use & Reliability
After several weeks of intermittent use, including extended periods where the RV’s propane system was continuously supplying the MER470 for the patio heater, I can attest to its reliability. The kit has shown no signs of wear. The brass fittings remain clean and free of corrosion, and the hose has maintained its flexibility without any cracking or stiffness. There have been no leaks whatsoever, which is paramount when dealing with propane.
Maintenance has been practically non-existent. A quick wipe down with a damp cloth is all that’s needed to keep the brass components looking their best. I haven’t needed to disassemble it for cleaning, and the overall construction suggests it will last for many seasons. Compared to the disposable 1lb cylinders I used to rely on, this kit feels like a significant upgrade in both convenience and long-term value, eliminating the constant expense and the environmental guilt of single-use containers.
Breaking Down the Features of Marshall Excelsior MER470 Flow Longer Propane Kit
Specifications
The Marshall Excelsior MER470 Flow Longer Propane Kit is comprised of two primary components. The first is the Marshall Excelsior MER415 Brass Tee Connection. This fitting features a .9 GPM excess flow male hard nose POL x female POL x 1-20 male configuration, allowing it to seamlessly integrate into a standard propane system while providing an outlet for the extension hose. The second component is the Marshall Excelsior MER421-144 12-foot Hose. This hose sports a .20 male x 1-20 female connection, designed to perfectly interface with the MER415 tee and the input of most small propane appliances.
These specifications are crucial for understanding the kit’s functionality. The .9 GPM excess flow rating on the tee signifies a safety feature that limits propane flow in the event of a hose rupture, preventing a potentially dangerous uncontrolled release of gas. The POL fittings are the standard connection for larger propane tanks, ensuring compatibility with RV and backyard propane supply lines. The 1-20 thread is a common size for smaller propane appliances that typically use disposable cylinders, making the transition straightforward. The 12-foot hose length provides ample reach to connect appliances without feeling constrained.
Performance & Functionality
In its core function, the Marshall Excelsior MER470 Flow Longer Propane Kit performs exceptionally well. It effectively diverts propane from a larger, regulated source to smaller appliances, eliminating the need for intermediate disposable cylinders. The flow rate provided is more than adequate for typical portable propane devices such as small grills, heaters, and lanterns, ensuring they operate at their intended capacity.
The primary strength of this kit lies in its ability to provide continuous, uninterrupted fuel. It seamlessly integrates with existing propane systems, and I experienced no discernible pressure drops or performance issues, even when running multiple appliances sequentially. A minor point for consideration, though not a weakness, is that the kit is designed for regulated propane sources; it does not inherently regulate pressure itself, relying on the existing regulator on the RV or backyard tank. This is standard practice, but it’s worth noting that the overall propane system’s regulator must be functioning correctly.
Design & Ergonomics
The design of the Marshall Excelsior MER470 kit is a testament to functional engineering. The use of solid brass for the tee connection speaks volumes about its intended durability and resistance to corrosion, a critical factor for outdoor equipment that may be exposed to the elements. The machining on the fittings is precise, ensuring a tight and secure seal upon connection.
Ergonomically, the kit is designed for simple, tool-free installation. The POL fittings and the 1-20 threads are designed for hand-tightening, making setup and breakdown quick and easy. The 12-foot hose offers good flexibility, allowing for convenient placement of appliances. The overall feel of the components is one of quality and reliability; there’s no flex in the hose that suggests weakness, and the brass fittings have a satisfying heft to them.
Durability & Maintenance
Given its construction, the Marshall Excelsior MER470 Flow Longer Propane Kit is built for longevity. The solid brass components are inherently durable and resistant to the corrosive effects of propane and outdoor exposure. The hose, while not the heavy-duty industrial type, appears to be of a sufficient grade for its intended purpose of powering relatively low-BTU appliances.
Maintenance is virtually non-existent. Beyond an occasional visual inspection for any physical damage or a light wipe-down, there’s little to do. The sealed nature of the connections means there’s no need for periodic tightening or lubrication unless you choose to disconnect and reconnect the system. I haven’t encountered any potential failure points in my usage, but as with any propane equipment, regular visual checks are always a prudent practice.
Accessories and Customization Options
The MER470 kit is quite specific in its purpose and includes the essential components for its intended function. It comes with the brass tee connection (MER415) and the 12-foot hose (MER421-144). There are no additional accessories included.
In terms of customization, the design is quite integrated. The hose is permanently attached to the fitting on one end and has a permanently attached fitting on the other. While this ensures a robust connection, it means the hose is not easily replaceable or customizable in terms of length without replacing the entire hose assembly or seeking specialized modifications. However, the standard configuration is well-suited for its intended use cases.
Pros and Cons of Marshall Excelsior MER470 Flow Longer Propane Kit
Pros
- Eliminates the need to purchase and dispose of small propane cylinders, saving money and reducing waste.
- Provides a continuous and reliable propane supply from a larger source like an RV or backyard tank.
- Features a .9 GPM excess flow safety valve on the tee connection for added security.
- Constructed with durable solid brass fittings for long-term use and corrosion resistance.
- Simple, tool-free installation makes it easy to set up and disconnect.
- The 12-foot hose offers good reach and flexibility.
Cons
- Not compatible with appliances that have non-standard propane inputs; relies on the common 1-20 thread.
- The hose length is fixed, limiting customization for very specific appliance placements.
- Requires an existing regulated propane source (e.g., RV, backyard tank with regulator).
Who Should Buy Marshall Excelsior MER470 Flow Longer Propane Kit?
This propane kit is ideal for recreational vehicle (RV) owners who want to power smaller appliances like portable grills or camp stoves from their RV’s main propane tanks without constantly buying and swapping disposable cylinders. It’s also a fantastic option for cottage or backyard patio owners who use portable propane heaters or small grills and wish to tap into their larger, permanently installed propane tanks. Anyone looking to reduce their reliance on single-use propane canisters and save money over time will find this kit to be an excellent investment.
Those who should probably skip this product are individuals who only occasionally use small propane appliances or who have very specific, non-standard propane connections on their appliances. If you need to power devices that require specialized fittings or operate at extremely high BTU outputs that might exceed the capacity of typical portable appliances, this kit might not be the right fit. For those users, a direct connection to a larger tank via a more robust regulator setup might be necessary. No essential accessories are truly required for operation, as the kit contains the necessary components.
Conclusion on Marshall Excelsior MER470 Flow Longer Propane Kit
The Marshall Excelsior MER470 Flow Longer Propane Kit delivers precisely what it promises: a convenient and cost-effective way to fuel smaller propane appliances from a larger, established propane source. Its robust construction, featuring solid brass fittings and a reliable hose, instills confidence in its long-term durability. The integration of an excess flow safety valve is a thoughtful touch that enhances user security.
Considering its price point of $119.99, the value proposition is strong, especially when weighed against the recurring cost and environmental impact of purchasing disposable propane cylinders over time. For RV owners, campers, and backyard enthusiasts looking to streamline their propane usage, this kit is a highly recommended solution. It’s a practical, well-built piece of equipment that simplifies a common problem, making outdoor cooking and heating significantly more convenient and economical. I would certainly recommend it to anyone fitting the profile of its intended user.