Aquascape 2" Dual Union Check Valve
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Description
The Aquascape Dual Union Check Valve 2.0 (48026) is the industry-standard check valve for Aquascape skimmer filter systems and Pondless Waterfall Vaults. The heavy-duty, swing-style flapper maximizes water flow when the pump runs, then seals against backflow the moment the pump shuts off — keeping your biological filter full and your skimmer from overflowing during restarts.
What sets the 2.0 apart: a set of innovative reversible fittings that rotate to any orientation, eliminating the guesswork of matching pump and filter fitting sizes. Standing 14” tall before extension, it fits inside standard skimmer chambers and extends for taller filter applications. Both union connections unscrew by hand — no tools required — making pump removal for winter storage or cleaning a 60-second job. Includes fittings for both 2” and 1.5” pipe connections right out of the box.
Key Features & Benefits
What’s Included
- Aquascape Dual Union Check Valve 2.0 body (swing-style flapper, dual union ends)
- (2) 2” MPT × 2” slip fittings (reversible)
- (1) 1.5” FPT × 2” slip fitting (reversible)
- (1) 2” check valve elbow
For pumps with 1.5” outlets, consider the 48026-1.5 variant which includes an additional 1.5” FPT × 2” slip fitting for full 1.5” pump compatibility.
Technical Specifications
| Specification | Value |
|---|---|
| SKU | 48026 |
| Product Name | Dual Union Check Valve 2.0 |
| Valve Size | 2 inches |
| Valve Type | Swing-style check valve (flapper design) |
| Union Design | Dual union — tool-free hand removal on both sides |
| Fittings Included | (2) 2” MPT × 2” slip + (1) 1.5” FPT × 2” slip + (1) 2” elbow |
| Reversible Fittings | Yes — rotate to desired orientation for universal fit |
| Valve Height | 14” before extension; extendable for taller filter applications |
| Function | Prevents backflow when pump is off; maximizes flow when pump runs |
| Compatible With | Aquascape Signature Series Skimmers, Pondless Waterfall Vaults, BioFalls filters |
| NOT Compatible With | Older black-style Aquascape check valves (threads redesigned) |
| Applications | Pond pump discharge lines, waterfall returns, pressurized filters |
48026 Variants
| SKU | Included Fittings | Best For |
|---|---|---|
| 48026 ← This | (2) 2” MPT×2” slip + (1) 1.5” FPT×2” slip + elbow | Standard 2” pump outlet installations |
| 48026-1.5 | (2) 2” MPT×2” slip + (2) 1.5” FPT×2” slip + elbow | Pumps with 1.5” outlets — provides full 1.5” fitting set |
Frequently Asked Questions
Why do I need a Dual Union Check Valve for my waterfall?
Without a check valve, every time your pump stops — whether during a power outage, manual shutdown, or winter shutdown — the water in your biological filter drains backward through the pump discharge line and down to the pond. This causes two problems: (1) the BioFalls or waterfall filter empties and the beneficial bacteria on your filter media temporarily lose water flow, stressing the colony; and (2) the sudden surge of water returns to the pond through the skimmer, potentially overflowing it. The 48026 check valve prevents both by sealing the discharge line the moment flow stops.
How does the "Dual Union" feature make maintenance easier?
The dual union design means both sides of the valve can be unscrewed completely by hand, with no tools. To remove the pump for cleaning, winter storage, or replacement: unscrew the lower union to disconnect from the pump, then unscrew the upper union to detach from the plumbing above. The valve holds the water in the filter line above it, preventing the filter from draining during pump removal. Reinstall in reverse order. The entire process takes about 60 seconds.
Will this valve affect the GPH of my pump?
Minimal impact. The swing-style flapper design opens fully when the pump runs, creating a wide, unobstructed flow path that minimizes friction loss. Unlike spring-loaded ball-type check valves (which require significant pressure to hold open against the spring tension), the swing flapper relies on gravity to close and water pressure to open — there’s no spring tension fighting the pump. At the flow rates of typical pond pumps (1,000–5,000 GPH), the 48026 imposes negligible head loss.
Is it compatible with a Pondless Waterfall Vault?
Yes — the 48026 is the standard check valve for Aquascape Pondless Waterfall Vaults (model 49000) and is also used in Aquascape Signature Series Skimmers. The valve mounts inside the vault chamber with the pump below and the discharge plumbing above, fitting within the compact space of these enclosures. The extendable height (14” before extension) accommodates standard vault depths, and additional height is available for deeper installations. The reversible fittings handle the pump outlet orientation without needing special adapters.
What should I do with the check valve during winter?
If winterizing completely: loosen both threaded unions by hand to drain the water from the valve body and discharge line — retained water can crack fittings if it freezes. Remove the pump following Aquascape’s winterization instructions. The valve itself can remain in place if fully drained. If running the pond year-round (common in climates with occasional frost), the valve continues operating normally as long as the pump runs — backflow prevention is especially important in winter when biological filter bacteria are sensitive to temperature swings from drain-back events.
Why Buy from Pond Pro Direct?
- Authentic Aquascape products
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- 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.
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For more information, please check out Price Match Policy Page
Shipping & Delivery
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- Typical handling time: 1–5 business days
- Typical transit time after shipment: 5–8 business days
- Estimated delivery window: 6–13 business days
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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).
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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
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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
