Home » Components » Fireye » Burner Controls » NEXUS » Fireye NXDBWLC Daughter board for use with NXEXP300 Fireye NXDBWLC Daughter board for use with NXEXP300 NXDBWLC Daughter board for use with NXEXP300. Provides 3 element water level control, surface and bottom down control for Total Dissolved Solids Add to Quote CartThis is a Request for Quote Only. Manufacturer Info Fireye << return to components