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The Aquascape Dual Union Check 2.0 is made to provide a professional pump and plumbing connection inside skimmer filter systems, as well as pond-less water vaults. A set of innovative reversible fittings take the guesswork out of finding the right pump or filter and allows the extension of valve height for taller filter applications. It also has innovative reversible fittings to allow for universal fittings. Its Dual-union, tool-free design make maintenance quick and easy. The heavy-duty, swing-style check valve flapper maximizes water flow through the valve when open. This is while preventing the backflow of water when the pump is shut off or during a power outage.