Explore our selection of SQ Flex, CR Flex, RSI, and Power Interface boxes—engineered to enhance pump system control, communication, and integration. These interface modules enable smart capabilities such as variable speed operation, remote monitoring, fault diagnostics, and compatibility with advanced control platforms. Ideal for both upgrades and new installations, they simplify setup with secure power terminals, LED status indicators, and intuitive wiring layouts. Compatible with a wide range of submersible and surface pump systems, these units provide a reliable bridge between pumps and controllers in solar, off-grid, or commercial applications. Need help selecting the right interface for your system? Our expert team is ready to assist. Enjoy fast U.S. shipping and secure checkout with every order from Pump‑Stop.com.