Pentair 075173 Fusible Link Thermal Cut-Off Replacement Pool and Spa Heater Fusible link thermal cut-off replacement Fits Pentair MiniMax CH, NT STD, NT LN, NT TSI, NT TSI pool and spa heater models 150 IID, 150, 200, 250, 300, 350, 400 Also fits Pentair MiniMax Plus, PowerMax pool and spa heater models 75, 100, 150, 200, 250, 300, 350, 400 Compatible with Pentair MiniMax, MiniMax Low NOx commercial heaters