Pentair Gas Orifice Kit Natural Gas | MasterTemp 400 | 77707-0411
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- SKU:
- 77707-0411
-
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About This Item
The Pentair Gas Orifice Kit (77707-0411) is the OEM replacement orifice kit for the MasterTemp 400NA natural gas heater. This kit supplies the metering orifices that regulate gas flow to the burner assembly — order this part when servicing or replacing the gas delivery components on a 400,000 BTU natural gas MasterTemp unit.
⚠️ IMPORTANT: NATURAL GAS HEATER COMPONENT — LICENSED TECHNICIAN 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: THIS IS A KIT
This listing is a kit that includes Item Nos. 3 and 4 from the MasterTemp 400 exploded diagram — not a single orifice. Confirm which items are required for your service before ordering.
⚠️ IMPORTANT: NOT INCLUDED WITH HEATER — ORDER SEPARATELY
This gas orifice kit is not supplied with the MasterTemp 400NA heater at the time of manufacture. It must be ordered separately when required for service.
The gas orifices in this kit meter the flow of natural gas to each burner port. Worn, corroded, or incorrectly sized orifices cause incomplete combustion, ignition failure, or unsafe burner operation. This OEM kit restores the factory-specified gas delivery to the 400,000 BTU MasterTemp burner tray.
Specifications
| Pentair Part Number | 77707-0411 |
| Part Name | Gas Orifice Kit — Natural Gas, Model 400 |
| Kit Contents | Includes Item Nos. 3 and 4 (per MasterTemp 400 exploded diagram) |
| Fuel Type | Natural Gas (NG) |
| Quantity Included | Kit (Each) |
Fits Into
| Brand | Equipment Line | Model / Part Number | Notes |
| Pentair | MasterTemp — MasterTemp Series | 400NA | Natural Gas, 400 Model. 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 orifices are not interchangeable — they are sized differently to account for the distinct pressure and energy content of each fuel. Before ordering, confirm your heater's fuel type is natural gas (NG) and that your model is the 400NA. The fuel type and model designation are printed on the heater's rating label. If your MasterTemp runs on propane (LP), this kit is not the correct part — consult your equipment manual for the LP orifice kit part number.
