Pentair Gas Orifice Kit Natural Gas for MasterTemp 125 Heater | 474981
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- SKU:
- 474981
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About This Item
The Pentair Gas Orifice Kit – Natural Gas (474981) is the OEM replacement orifice kit for the MasterTemp 125 Natural Gas Heater. This kit is not included with the heater at purchase and must be ordered separately for natural gas installations.
⚠️ IMPORTANT: KIT CONTENTS — Nozzle and o-ring
This listing is a kit, not a single orifice. It includes the brass nozzle and o-ring as referenced in the MasterTemp 125 exploded parts diagram. Confirm both items are needed before ordering.
⚠️ IMPORTANT: LICENSED PROFESSIONAL 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.
The gas orifice controls the flow of natural gas into the MasterTemp 125 burner assembly, directly governing combustion performance and heating output. A damaged, corroded, or incorrectly sized orifice will result in improper flame characteristics, reduced heating efficiency, or failure to ignite. This kit provides the correct orifice configuration for natural gas supply — it is not interchangeable with the propane (LP) orifice kit.
Specifications
| Pentair Part Number | 474981 |
| Part Name | Gas Orifice Kit – Natural Gas |
| Kit Contents | Includes brass nozzle and o-ring (per MasterTemp 125 parts diagram) |
| Gas Type | Natural Gas (NG) |
| Quantity Included | Kit (Each) |
Fits Into
| Brand | Equipment Line | Model / Part Number | Notes |
| Pentair | MasterTemp 125 Heater — MasterTemp Series | MT125 | Natural Gas Orifice Kit; not included with heater, order separately |
| Pentair | MasterTemp 125 Heater — MasterTemp Series | MasterTemp125 | Gas Orifice Kit – NG; not included with heater, order separately |
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.
Pro Tip
Natural gas and propane orifice kits are not interchangeable — they are sized differently to match the energy content and supply pressure of each fuel type. Before ordering, confirm your heater is plumbed for natural gas and that your existing orifice is stamped or labeled "NG." If you are converting fuel types, consult the MasterTemp 125 installation manual and engage a licensed gas technician — fuel type conversion involves more than an orifice swap and must meet local gas code requirements.
