Description
xProduct overview
The Red Sea Max E, S & Reefer Replacement ATO Float Valve, part number 40373, is designed to keep your reef tank’s water level balanced with a straightforward, purpose-built solution. This compact valve is a direct replacement for the Auto Top-Off system in Red Sea Max E, S and Reefer models, ensuring you can maintain the tank’s designed top-off routine without extra guessing.
With a focus on reliability in everyday reef-keeping, the valve integrates with your existing ATO setup to help you manage evaporation-driven water loss. The small, rugged design is intended to operate smoothly in a bustling marine environment, where consistency matters as much as simplicity.
Core benefits you may notice
- Automatic top-off compatibility helps keep water levels steady through the day and night, potentially reducing salinity swings from evaporation.
- Compatibility with Red Sea Max E, S, and Reefer series preserves your tank’s designed balance and equipment compatibility.
- A dedicated float mechanism can lower the risk of overfill during topping off by providing a controlled shut-off response.
Why this replacement matters
In reef tanks, stable water height supports predictable lighting depth, flow patterns, and coral health. This replacement valve is built to slot into your Red Sea setup and restore a previous level of top-off control. While results can vary with other system components, using a purpose-made valve reduces the number of ad-hoc fixes you might try.
Real-life scenarios include routine maintenance where you are refreshing an aging ATO component, or when you want a dependable spare to minimize downtime after a part swap. The 40373 valve is designed to fit the Red Sea ecosystem, helping you maintain a steady routine without extensive modification.
Compatibility and quick-reference details
- Part number: 40373
- Brand: Red Sea
- Fits: Max E, S and Reefer models
FAQ
Q: What tanks is this valve compatible with?
A: Compatible with Red Sea Max E, S, and Reefer series aquariums as a replacement ATO float valve.
Q: Will this valve guarantee stable water levels?
A: It supports automatic top-off control to help maintain water level, but results depend on your system setup and maintenance.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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