*PLUMBERSSTOCK EXPERT* responded:
Hello there! We appreciate you asking about our Heatlink 56231 Zone Valve Actuator. Yes, this will be a good replacement for your Unicor AA4020 if you are using a brass valve. But if you are using a manifold, the Heatlink 56230 Manifold Zone Motor. is what you need. To start placing an order, just click Add To Cart in the product web page and fill in the required fields. Should you have further questions, please let us know. We are eager to make online shopping as fast and easy for you! Thank you for shopping with plumbersstock.com – the perfect site to find high-quality products at low, low prices!