The Outdoor Plus · Fuel & Conversion
TOP Fire Pit LP↔NG Gas Conversion
TOP pits can be converted between LP and NG — but it's a parts swap, not a knob flip. Orifice, flex hose, and air-mix fixture all change. Call TOP support for the model-specific kit, and verify the burner is approved for your target gas type before you start.
By Ash · Updated November 8, 2026
What you need
- Conversion kit from TOP (OPT-232A air mix + OPT-NG012 orifice + OPT-241 NG hose for LP→NG; OPT-1300 regulator + hose for NG→LP)
- Adjustable wrench
- Phillips screwdriver
- Soap-water leak test solution
- Licensed gas contractor (for NG hookup side)
Step by step
Shut off gas at the source and disconnect
LP tank off and disconnected, or NG shutoff closed. Pull the propane cylinder completely away. Verify zero pressure at the pit.
Pull the burner plate
Access panel open, burner plate lifted straight up. Underneath: the orifice (threaded into the burner), the air mix fixture, the flex hose.
For LP → NG: swap orifice, open the air mix, swap the hose
Remove the LP orifice, install the OPT-NG012 NG orifice. Rotate the air mix fixture to EXPOSE its six holes (NG needs more air). Replace the LP QCC-1 hose with the OPT-241 NG flex hose (1/2" × 36" whistle-free). Connect NG supply side (licensed contractor).
For NG → LP: swap orifice, close the air mix, install the LP regulator + hose
Remove the NG orifice, install the LP orifice (part number varies by model — call TOP). Rotate the air mix fixture to COVER its six holes (LP needs less air). Install the OPT-1300 LP regulator + hose assembly. Connect to a 20-lb LP cylinder.
Reinstall the burner plate
Lower straight down onto its mounting tabs. Verify the thermocouple (on electronic models) is seated in the flame path.
Leak test the new configuration
Mandatory. Soap-water every joint, gas on at source, knob OFF. Bubbles = tighten or swap part. Do NOT fire until the test passes.
Load media and perform first-light
Standard procedure — media max 1" over burner, first-light purge cycle, confirm flame pattern looks correct for your new gas type.
Common mistakes
- Skipping the air mix fixture adjustment. The orifice swap is only half the job. The air mix fixture controls primary air into the burner — wrong position = wrong combustion mix = bad flame.
- Reusing the LP hose for NG supply. LP hose is rated differently than NG hose. Swap to the OPT-241 NG flex hose. The manual is specific.
Hands-on tips
- If you're not 100% confident in the conversion, don't DIY — book TOP support or a licensed gas tech. A gas-system mistake is not worth saving a service call.
- Photograph the burner assembly before conversion. Reassembly reference.
Questions people ask
Can every TOP pit convert?
Most can — but not all. Call TOP support at (909) 460-5579 with your model number first. Some self-contained units have fuel-specific designs.
Does conversion void the warranty?
Only if done with non-TOP parts or incorrectly. A proper conversion with TOP-supplied kit parts installed per the manual preserves the warranty.
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