For Hayward FDXLICB1930 FD Integrated Control Board Replacement Kit Fits for Select Hayward H-series Pool Heater Models H250fdn, H250fdp, Also Fits for Hayward Universal H-series Low Nox Pool Heater. Scope of application? :Designed For Use In Hayward H-series Low Nox Heaters. Advantage? :FDXLICB1930 FD Series Integrated Control Board is a replacement product designed fits for Hayward H-Series Low NOX Heaters. This product is intended for use in IDL Heaters that were manufactured after September 20, 2004. If your heater model number ends with an FDN or FDP this product will work for your replacement needs. Direct Replacement? The Universal H-Series is an energy efficient, high performance, installation adaptable commitment to the pool service? This product meets or exceeds OEM specifications and has been factory tested. Old parts can be replaced directly, safe and reliable, and stable performance! Believe me, it is the ideal choice for you to be safe and reliable. High quality materials? Fdxlicb1930 Fd Integrated Control Board is made of the latest upgraded materials, with stable performance and excellent moisture resistance. Reliable use and longer service life. It is more convenient to use and install. 100% Satisfaction Guarantee? Your satisfaction is our top priority, We strive to provide customers with quality services.