ADA Check Valve - High-Quality Brass Check Valve for Water, Air, and Gas - Perfect for Plumbing, Irrigation, and Industrial Applications

This product has an estimated wait period of 7+ days for shipping.
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The check valve allows CO2 to be injected in the Nature Aquarium system but will prevent water from flowing back. You can use the more sophisticated ADA Cabochon Ruby check valve for a neater look.