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Hi! Thank you for visiting Plumbersstock. We apologize for the confusion but the Flotec Fp0026-10 is the check valve itself. This works with the FPDC20Battery Back-up System. If you are asking whether the Fp0026-10 is replaceable, yes it is since this part is being sold separately. For additional information, please refer to this manual. To start placing an order, just click Add To Cart and fill in the required fields. Should you have further questions, please ask away! Thank you for visiting Plumbersstock.com. Have a great day!