Pentair Tub O-Ring Kit for MasterTemp & Max-E-Therm Heaters | 474952
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- SKU:
- 474952
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About This Item
The Pentair Tub O-Ring Kit (474952) is the OEM replacement kit for MasterTemp and Max-E-Therm heaters equipped with the new 9-bolt lid tub design, manufactured after November 16, 2013.
IMPORTANT: KIT CONTENTS — NOT A SINGLE PART
This listing is a complete kit, not an individual O-ring. Each kit includes a Clamp Assembly, O-Ring, and Silicone Tube — all components required for a full tub seal service.
IMPORTANT: POST-11/16/13 HEATERS ONLY — 9-BOLT LID TUB DESIGN
This kit fits MasterTemp and Max-E-Therm heaters manufactured after November 16, 2013 with the new 9-bolt lid tub design. Heaters built before this date use a different tub configuration and require a different kit. Verify your heater's manufacture date before ordering.
IMPORTANT: GAS HEATER COMPONENT — PROFESSIONAL SERVICE REQUIRED
Gas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high-voltage components without proper certification.
IMPORTANT: LUBRICATION REQUIRED — SOLD SEPARATELY
Always lubricate this O-ring with a silicone-based lubricant before installation. We carry the Pentair R172351 Lifeguard Silicone Lubricant — the OEM-matched product for Pentair equipment.
The tub O-ring seals the combustion chamber lid on MasterTemp and Max-E-Therm heaters, maintaining the pressure boundary between the combustion zone and the surrounding heater cabinet. A degraded or compromised O-ring can allow combustion gases to escape the chamber, reducing heater efficiency and creating a potential safety hazard. The included clamp assembly, O-ring, and silicone tube complete the service, restoring the full tub seal.
Specifications
| Pentair Part Number | 474952 |
| Part Name | Tub O-Ring Kit |
| Part Category | O-Ring Kits |
| Kit Contents | Clamp Assembly, O-Ring, and Silicone Tube |
| Quantity Included | 1 Each |
| Application | Heaters manufactured after 11/16/13 — 9-bolt lid tub design only |
Fits Into
| Brand | Equipment Line | Model / Part Number | Notes |
| Pentair | MasterTemp | 175NA | Tub O-ring kit with clamp assembly, O-ring and silicone tube; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 175LP | Tub O-ring kit with clamp assembly, O-ring and silicone tube; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 200NA | Tub O-ring kit with clamp assembly, O-ring and silicone tube; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 200LP | Tub O-ring kit with clamp assembly, O-ring and silicone tube; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 250NA | Tub O-ring kit with clamp assembly, O-ring and silicone tube; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 250LP | Tub O-ring kit with clamp assembly, O-ring and silicone tube; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 300NA | Tub O-ring kit with clamp assembly, O-ring and silicone tube; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 300LP | Tub O-ring kit with clamp assembly, O-ring and silicone tube; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 400NA | Tub O-ring kit with clamp assembly, O-ring and silicone tube; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | 400LP | Tub O-ring kit with clamp assembly, O-ring and silicone tube; for heaters manufactured after 11/16/13 (9-bolt lid tub design) |
| Pentair | MasterTemp | MT125 | Combustion Chamber Gasket Kit |
| Pentair | MasterTemp | MasterTemp125 | Combustion Chamber Gasket Kit |
| Pentair | Max-E-Therm | 333NA | For heaters manufactured after 11/16/13 (New 9-Bolt Lid Tub Design). Includes Clamp Assembly, O-Ring, and Silicone Tube. |
| Pentair | Max-E-Therm | 333LP | For heaters manufactured after 11/16/13 (New 9-Bolt Lid Tub Design). Includes Clamp Assembly, O-Ring, and Silicone Tube. |
Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering.
Poolaroo Pro Tip
Locate your heater's manufacture date label — typically found on the inside of the front door panel or on the rating plate — before ordering. This kit is designed exclusively for the 9-bolt lid tub design introduced after November 16, 2013; counting the bolts on your combustion chamber lid is a reliable field check, since 9 bolts confirms this is the correct kit. Always lubricate the new O-ring with Pentair R172351 Lifeguard Silicone Lubricant before installation to protect the seal and ease seating during reassembly.
