Pentair 472364 In/Out Bottom Sub-Header Assembly Replacement MiniMax Pool and Spa Heater In/out bottom sub-header assembly replacement Fits Pentair MiniMax NT STD, LN, TSI heater with 6800 controller models 200, 250, 300, 400 Also fits Pentair MiniMax NT STD, LN, TSI heater with DDTC controller models 200, 250, 300, 400