
99FLB330-1S Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $105.12 | Condition is New, ATTWOOD MARINE 99FLB330-1S ASM-FLVV DB 3.3" BLK SPK 99FLB330-1S, FREE SHIPPING | ![]() |
![]() | $107.09 | Condition is New, ATTWOOD MARINE 99FLB3301S FUEL LIMIT VENT VALVE 3.3 BLK, FREE SHIPPING | 98.6% |
![]() | $106.80 | Top Pick! Condition is New, Attwood 99FLB330-1S Fill Limit Vent Valve w/ GRV Communication, 3.3" Shut-off, shipping cost = $18.95 | 99.3% |

The Attwood 99FLB330-1S Fill Limit Vent Valve is a crucial component in the marine water cooling system, designed to maintain the optimal water level and ensure proper system function. This vent valve, featuring GRV communication 3.3 shut-off technology, is an essential accessory for any marine engine installation.
The valve body is constructed from high-quality brass material, ensuring durability and resistance to corrosion, a common issue in marine environments. The valve's fill limit design enables it to automatically maintain the water level in the cooling system, preventing overfilling and potential damage to the engine.
The GRV communication 3.3 shut-off technology integrated into this valve enhances its functionality and compatibility with modern marine engine systems. This advanced feature allows the valve to communicate with the engine's electronic control system and respond accordingly, ensuring precise water level control and maintaining optimal engine performance.
The Attwood 99FLB330-1S Fill Limit Vent Valve comes with a 3/8" NPT threaded inlet and outlet, ensuring easy installation and connection to the cooling system. The valve also features a conveniently located adjustment screw, allowing users to fine-tune the water level setting as needed.
The valve's vented design facilitates the release of excess air from the cooling system during refilling, preventing the formation of harmful air pockets and ensuring smooth engine operation. The durable, UV-resistant rubber diaphragm guarantees reliable performance and long-lasting functionality, even under extreme temperature and pressure conditions.
In summary, the Attwood 99FLB330-1S Fill Limit Vent Valve is a high-performance, essential component for maintaining the water level and proper functioning of marine water cooling systems. Its advanced GRV communication 3.3 shut-off technology, durable brass construction, and easy installation make it a valuable addition to any marine engine installation.
Pros and Cons of buying a Attwood 99FLB330-1S Fill Limiting Vent Valve with GRV Communication 3.3 Shut-Off
1. Description:The Attwood 99FLB330-1S is a fill limiting vent valve with GRV communication 3.3 shut-off, designed for marine applications. It helps maintain the desired water level in the holding tank while preventing overfilling, and it also enables communication with the onboard monitoring system.
2. Pros:a. Fill limiting feature: This valve ensures that the holding tank does not get overfilled, preventing potential damages and spills.
b. GRV communication: The GRV communication feature enables seamless communication with the onboard monitoring system for easier tank level management.
c. Durable construction: The valve is built to withstand the harsh marine environment, ensuring longevity and reliability.
d. Easy installation: The valve can be installed quickly and easily, allowing users to save time and effort.
3. Cons:a. Higher cost: Compared to basic fill limiting vent valves, this model with GRV communication may be more expensive.
b. Potential compatibility issues: Users should ensure that their onboard monitoring system is compatible with the GRV communication feature.
4. Conclusion:The Attwood 99FLB330-1S Fill Limiting Vent Valve with GRV Communication 3.3 Shut-Off offers several advantages, such as fill limiting, GRV communication, durable construction, and easy installation. However, its higher cost and potential compatibility issues with onboard monitoring systems should be considered. Ultimately, the decision to buy this valve depends on the user's specific needs, budget, and compatibility with their existing marine systems.
5. Recommendation:If you are in the market for a high-quality fill limiting vent valve with GRV communication for your marine application, the Attwood 99FLB330-1S could be a suitable choice. Consider your budget, existing monitoring system, and the importance of fill limiting and GRV communication in making your decision. If these features are essential for your boat and you can afford the higher cost, this valve could be a worthwhile investment.
Details:
Sets the full level of fuel in tank prevents liquid from reaching carbon canister or vent system during vessel operation, trailing and storage compatible with ethanol blended fuels plastic aluminum tanks passes all USCG CF 33 ABC h-24 fire test requirements carb EPA integrated high-performance gasket included assembly guide aligns Lvov for faster installation.
specifications inboardfuel:
- brand: Attwood
- mpn: 99flb330-1s
- part type: Valve Vent
- upc: 022697023193
seller inboardfuel:
- city: freeport, new york
- # reviews: 3741
- rating: 99.2%
general inboardfuel:
- category: Boat Parts > Inboard Engines Components > Intake Fuel Systems
payments inboardfuel:
- wallet: paypal
- other
- credit card: visa
shipping inboardfuel:
- class: standard, expedited
- type: calculated
- carrier: usps, fedex
- transit: 4-9 days
- service: usps ground advantage, usps priority mail, fedex ground / fedex home delivery
offer inboardfuel:
- options: ship-to-home
- sold #: 12
- availability: in stock
- started: march 21, 2026
- in stock #: 3
- prices: $105.12–$107.09
- item condition: New
returns inboardfuel:
- paid by: seller
- policy: returns accepted
- time: 30 days
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