For Classic Dual Ready & Pallet Burner Dual Ready models: Replacement waterjacket snap discs (p/n 4099 is the center disc & p/n 5712 is the RH/LH snap disc). For Maxim 175 & Maxim 250 models: Replacement waterjacket snap disc. For Maxim 255P models: Replacement waterjacket snap disc for s/n M210000-M210002. For E-Classic 1400/1450/2300/2400/3200/3250 (Non-European) models: Replacement waterjacket snap disc. For E-Classic 1450 (European) models: Replacement waterjacket snap disc for s/n E102166 and down. For E-Classic 2400 (European) models: Replacement waterjacket snap disc for s/n E301508 and down. For E-Classic 3200 (European) models: Replacement waterjacket snap disc for s/n E400305 and down.