Atlantic 12" 316 Stainless Steel Spillway – Formal Waterfall Weir for Pondless Waterfalls, Pools & Modern Water Features
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Description
The Atlantic Water Gardens SS12-316 is a 12” wide, heavy-gauge 316 marine-grade stainless steel spillway (also called a scupper) engineered for formal waterfall installations in wall structures, poolscapes, and hardscapes. At just 4” tall, it drops into standard garden wall block construction without any cutting — replacing a single course block for a seamless, professional installation. The structural housing supports 80 lbs per linear foot of overburden, making it safe to build masonry, stone, and concrete directly over the spillway body.
At its rated maximum of 1,200 GPH, the SS12-316 delivers a 9”–10” water projection from an 18” fall height — a dramatic, smooth sheet that catches light beautifully and adds significant acoustic value to any outdoor space. The internal weir baffle ensures an even, gap-free water curtain across the full 12” width. Backed by a 3-Year Limited Manufacturer Warranty.
Key Features & Benefits
Technical Specifications
| Specification | Value |
|---|---|
| SKU | SS12-316 |
| Width | 12” |
| Full Dimensions (W × D × H) | 12” × 8-1/2” × 4” |
| Material | Heavy-gauge 316 stainless steel (marine grade) |
| Inlet | 1-1/2” FPT (female pipe thread) |
| Max Flow Rate | 1,200 GPH |
| Water Projection | 9”–10” at 18” fall height (1,200 GPH) |
| Max Fall Height (clear sheet) | ~3 ft above basin (above this height, sheet breaks up) |
| Load Bearing | 80 lbs per linear foot |
| Wall Block Fit | Replaces standard 4” garden wall block without cutting |
| Installation | Wall-mounted / recessed into masonry |
| Chlorinated Water | Yes — 316 marine grade suitable for pools, spas, salt systems |
| LED Compatible | Yes — Atlantic 12” LED Light Bar (sold separately) |
| Warranty | 3-Year Limited Manufacturer Warranty |
316 Stainless Steel Spillway Family
| Model | SKU | Width | Dimensions (W×D×H) | Inlet |
|---|---|---|---|---|
| 12” Spillway ← This | SS12-316 | 12” | 12”×8.5”×4” | 1-1/2” FPT |
| 24” Spillway | SS24-316 | 24” | 24”×8.5”×4” | 1-1/2” FPT |
| 36” Spillway | SS36-316 | 36” | 36”×8.5”×4” | 1-1/2” FPT |
Frequently Asked Questions
What is the difference between 304 and 316 stainless steel spillways?
Both are stainless steel, but their alloy composition differs in a critical way:
- 304 stainless contains 18% chromium and 8% nickel — excellent for freshwater applications but susceptible to pitting in chlorinated or saline environments over time
- 316 stainless contains 16% chromium, 10% nickel, and 2% molybdenum — the molybdenum dramatically improves resistance to chlorides, including pool chemicals, salt-chlorine generators, seawater, and deicing salts
The SS12-316 is the professional choice for any installation where chlorine or salt contact is possible — poolscapes, spa walls, coastal gardens, or commercial environments where deicing products are used.
What is the recommended flow rate for this 12-inch spillway?
The SS12-316 has a maximum flow rate of 1,200 GPH. At 1,200 GPH, the water sheet projects 9”–10” from the face of the wall at an 18” fall height — size your basin or splash area accordingly.
For a thinner, more subtle flow, reduce pump output below 1,200 GPH. For the most dramatic sheer descent effect with a thick, even curtain, run the pump near full rated capacity. A pump with adjustable flow control gives you the most visual flexibility.
Keep the fall height at approximately 3 feet or less above the basin water level for a clean, unbroken water sheet. Greater heights cause the sheet to break into droplets.
Does this spillway include internal baffles?
Yes. The SS12-316 features an internal weir baffle that calms turbulent water before it reaches the spillway lip. Without this, the momentum of water entering the housing at the inlet creates uneven pressure across the weir, producing gaps and channels in the water sheet. The baffle distributes water pressure evenly across the full 12” width for a consistent, smooth curtain. The weir design is also non-clogging — debris passes through rather than accumulating.
Can the 316 Stainless Steel Spillway be used in swimming pools?
Yes — the SS12-316 is the preferred choice for swimming pools, spas, and any water feature using chlorinated water or salt-chlorine generation systems. The 316 grade’s molybdenum content provides significantly better resistance to chloride-induced pitting corrosion compared to standard 304 stainless steel. It is also suitable for coastal environments and areas where deicing salts are used.
How do I install the spillway into a masonry wall?
The SS12-316 is designed for masonry wall integration:
- The 4” height replaces a standard 4” garden wall block without any cutting — simply omit one block from the course where the spillway will be installed
- Connect plumbing to the 1-1/2” FPT (female pipe thread) rear inlet — use a 1.5” male pipe thread (MPT) fitting from your supply line
- The structural housing supports 80 lbs per linear foot, so blocks, mortar, and stone can be placed directly over the spillway body
- Ensure the spillway is level side-to-side for an even water sheet across the full 12” width
- The spillway can be recessed fully into the wall with only the stainless lip visible
Does this spillway support LED lighting?
Yes. The SS12-316 is fully compatible with the Atlantic 12” LED Light Bar (sold separately). Position the light bar behind the falling water sheet to illuminate the curtain from below or behind. Color-changing LED options allow dynamic color sequences at night, transforming the water feature into a focal point after dark.
Why Buy from Pond Pro Direct?
- Authentic Atlantic Water Gardens products with 3-Year Limited Warranty
- Expert installation guidance — call or text (765) 508-4352, Mon–Fri 9am–5pm EST
- Free shipping on all orders
- Price match guarantee on identical products
- 30-day return period on eligible items
Price Match
At Pond Pro Direct, we want you to shop with confidence, knowing you’re always getting a good deal.
We will match or beat the lowest online price on its products.
If you find a lower price for any products on our store, we will beat it by $50 for products listed over $2000. In order to be eligible, you must provide proof, whether a screenshot, invoice, email, etc. of the lower offer.
Please note that this does not apply to every product in the store, so reach out via email or chat for confirmation before purchasing.
For the policy to apply, simply send us a screenshot, link, or any other proof of the lower price.
For more information, please check out Price Match Policy Page
Shipping & Delivery
Order Processing
Orders are processed within 1–5 business days, depending on product type, brand, and fulfillment method. Products sold on Pond Pro Direct ship directly from manufacturers or authorized distribution partners and do not ship from a single centralized warehouse.
Processing times may vary by brand, item type, fulfillment method, and whether an item is made to order or ships via freight.
Order Confirmation
After placing your order, you will receive an order confirmation email confirming that we have received your order and pre-authorized your payment method.
Once your order is received, we contact the manufacturer or distribution partner to confirm availability and fulfillment timelines.
- If an item is unavailable or on backorder, we will notify you by email and void the pre-authorization.
- If the item is available, the payment will be processed and the order submitted for shipment.
Order Shipment
If your order is in stock and payment is processed, it will typically ship within 6–13 business days. Once your order ships, tracking information (when available) will be sent to the email address provided at checkout.
If you do not receive shipping confirmation within 6 business days, please contact us at support@pondprodirect.com.
Shipping Destinations
At this time, we primarily ship within the United States. Some products may be available for shipment to Canada. If the website allows checkout and accepts your shipping address, the product is eligible for delivery to that location.
Changing Your Shipping Address
Address changes after an order has been processed or shipped may result in delays or additional carrier fees. Any carrier charges associated with address changes are the responsibility of the customer.
Shipping Times
All shipping times are estimates only and not guarantees.
- Typical handling time: 1–5 business days
- Typical transit time after shipment: 5–8 business days
- Estimated delivery window: 6–13 business days
Delivery timelines may vary based on brand, item type, production status, freight requirements, and carrier availability.
If an order is cancelled after it has been processed or shipped, the customer may be responsible for applicable shipping charges, freight fees, carrier return fees, and warehouse handling costs, where applicable.
Shipping Options
Available shipping options vary by product and location.
Our standard Curbside Delivery option is provided at no additional cost where applicable and delivers the item to the curbside or driveway of the delivery address.
Additional options, such as Threshold Delivery or White Glove Delivery, may be available for select products and locations.
For full details regarding freight delivery, inspection requirements, liftgate service, returns, and customer responsibilities, please review our full Shipping Policy page.
Returns & Refunds
Cancellations & Refunds
Orders may be canceled free of charge before shipment, unless the item is classified as Custom or Made-to-Order (see below).
If you have questions about your order, please contact us at support@pondprodirect.com or call (765) 508-4352 during business hours.
Cancellations (Before Order Ships)
If you need to cancel an order before it ships, please contact us as soon as possible. Orders canceled prior to shipment are eligible for a full refund.
You can reach our team by phone at (765) 508-4352, via live chat on our website, or by email at support@pondprodirect.com.
Cancellations (After Order Ships)
Once an order has shipped or entered fulfillment, it may no longer be eligible for cancellation. If you no longer wish to keep the item, you must wait until delivery and then request a return.
A Return Merchandise Authorization (RMA) is required before returning any item.
Custom or Made-to-Order Items
Custom or made-to-order products are produced specifically for your order and cannot be canceled or refunded once production has begun, except in cases of defect or error.
Product pages will clearly indicate when an item is custom or made-to-order. If you are unsure whether an item falls into this category, please contact us before placing your order.
Returns & Refunds
Returns are subject to the following conditions:
- Customers have 30 days from delivery to request a return, unless otherwise stated on the product page or by manufacturer policy
- Items must be unused, uninstalled, and in original packaging
- An RMA is required prior to returning any item
Because we ship products directly from manufacturers, return eligibility may vary by brand. If a manufacturer does not permit returns on a specific product, we may be unable to accept the return. Please contact us if you would like confirmation of return eligibility for a specific item.
Fees & Shipping Costs
- Return shipping costs are the responsibility of the customer unless the item is defective or shipped in error
- Freight / LTL shipments may incur higher return shipping costs due to carrier fees
- Approved returns of non-defective items may be subject to a restocking fee of up to 25%
- Original outbound shipping charges are non-refundable
If you are exchanging an item rather than returning it outright, we may be able to assist with some costs depending on the product and manufacturer.
For full details, including freight deliveries, damage reporting requirements, and manufacturer-specific terms, please review our complete Return and Refund Policy
