Antunes Pressure Switch Guide: JD-2 Color Chart & Gas Switch Codes
Jul 15th 2026
Product Guide
The JD-2's spring color tells you its pressure range — get the color wrong and the switch won't trip where you need it to. Here's how to read the JD-2 lineup and decode Antunes' gas pressure switch model codes (LGP, HGP, RLGP, HLGP) so you order the right part the first time.
Antunes Controls Distributor · Same-day shipping by 2 PM CT · Ships from Memphis
Quick Answer: What color is my Antunes JD-2 pressure switch?
The JD-2's internal spring color sets its pressure range: Blue = .07"–1.7" W.C., Grey = .1"–4" W.C., Purple = .1"–10" W.C., Red = .1"–24" W.C., Orange = 5"–35" W.C. Check the spring color or part number on your existing switch, then match it to the full color chart below.
Antunes Controls makes two distinct families of pressure switches used across HVAC, burner, and boiler systems: the JD-2 series, a compact air differential/vacuum/pressure switch used for air proving and draft sensing, and a broader line of gas pressure switches used as high- and low-gas-pressure safety interlocks on burner and boiler gas trains. Both are adjustable, die-cast aluminum construction, and span settings from as low as .07" W.C. up to 110" W.C. depending on model.
Crossroads Industrial Services acquired the Antunes pressure switch product line in 2017 and continues to manufacture it under the Antunes Controls name — so the part numbers you'll find under "Antunes" and "Crossroads Controls" refer to the same switches.
The JD-2 is Antunes' most widely used air pressure switch — a compact SPDT auto-reset switch for air proving, fan interlock, and draft sensing in HVAC and burner control circuits. Every JD-2 is the same body; what changes between models is the internal spring, color-coded to a specific pressure range. Match the color (or the range) to your application before you order.
| Spring Color | SKU | Pressure Range | Reset Type | Connection |
|---|---|---|---|---|
| Blue (JD-2B) | 801111301 | .07"–1.7" W.C. | Auto Reset | 1/8" NPT |
| Grey | 801111302 | .1"–4" W.C. | Auto Reset | 1/8" NPT |
| Red (JD-2R) | 801111303 | .1"–24" W.C. | Auto Reset | 1/8" NPT |
| Purple (JD-2P) | 801111310 | .1"–10" W.C. | Auto Reset | 1/8" NPT |
| Orange | 801111315 | 5"–35" W.C. | Auto Reset | 1/8" NPT |
Don't have the color, only an old part number? Give us the model or SKU off the nameplate and we'll cross it to the correct spring color and W.C. range.
Antunes gas pressure switches use a letter code that tells you the function before you even check the W.C. range. Once you know the code, you know what the switch does.
LGP
Manual reset. Trips on low gas supply pressure to shut down the burner before it runs gas-starved. Example: 803112502 (2–14" W.C.).
RLGP
Same low-gas-pressure function as the LGP, but self-clears once pressure is restored instead of requiring a manual reset. Example: 803112701 (1–6" W.C.).
HGP
Manual reset. Trips on excess gas supply pressure to protect downstream regulators and burner components. Example: 8101121228 (2–20" W.C.).
HLGP
One body, two independent SPDT switches — high and low gas pressure interlocks in a single device. Example: 804111701 (2–16" W.C. high / 1–6" W.C. low).
Letter suffixes (A, G, H, D) after the function code indicate the design generation or switch configuration (SPDT vs. DPDT, connection style) — always confirm against the full model number, not just the function code, since ranges and connections vary between generations.
A sample of commonly ordered Antunes switches. Browse the full Antunes catalog here for current pricing and availability.
| SKU / Model | Series | Range | Reset | Switch Type | Connection |
|---|---|---|---|---|---|
| 801111301 (JD-2B) | JD-2 Air | .07"–1.7" WC | Auto | SPDT | 1/8" NPT |
| 801111303 (JD-2R) | JD-2 Air | .1"–24" WC | Auto | SPDT | 1/8" NPT |
| 803112502 (LGP-A) | Low Gas | 2"–14" WC | Manual | SPDT | 1/4" NPT |
| 803112701 (RLGP-A) | Low Gas | 1"–6" WC | Auto | SPDT | 1/4" NPT |
| 8101121228 (HGP-G) | High Gas | 2"–20" WC | Manual | SPDT | 1/4" NPT |
| 803113302 (RLGP-H) | Low Gas | 6–15 PSI | Auto | SPDT | — |
| 804111701 (HLGP-A) | Combined Hi/Lo Gas | 2"–16" WC hi / 1"–6" WC lo | Manual | 2-SPDT | 3/8" NPT hi / 1/8" NPT lo |
Confirming induced- or forced-draft fan airflow before allowing ignition. → JD-2 series, spring color matched to the required W.C. differential
Shutting down the burner if incoming gas supply pressure drops below a safe threshold. → LGP or RLGP series
Protecting downstream regulators and valve trains from excess supply pressure. → HGP series
Space-constrained panels needing both interlocks without two separate switches. → HLGP series
How do I know which JD-2 spring color I need?
Match the W.C. pressure or differential your application needs to trip at against the ranges in the color guide above. If you're replacing an existing switch, the spring color or part number on the old unit is the fastest way to confirm — send it to us and we'll look it up for you.
What's the difference between manual and auto reset gas pressure switches?
Manual reset switches require someone to physically clear the fault at the device before the burner can restart — used where an unattended automatic restart isn't acceptable. Auto reset switches clear themselves once pressure returns to the normal range. Check your equipment manufacturer's specification or local code requirement before substituting one for the other.
Can I use a JD-2 air switch as a gas pressure interlock, or vice versa?
No. The JD-2 is built and rated for air/draft proving, while the LGP/HGP/RLGP/HLGP series are gas pressure switches for burner gas train interlocks. They're not rated or approved for the other's application.
Is "Crossroads Controls" the same as Antunes?
Yes — Crossroads Industrial Services acquired the Antunes pressure switch product line in 2017 and continues to manufacture the same switches and part numbers under the Antunes Controls name.
Does Memphis Control Center stock Antunes pressure switches for same-day shipping?
Yes — we carry the JD-2 series across all spring colors along with the LGP, HGP, RLGP, and HLGP gas pressure switch lines. Orders placed by 2 PM CT on in-stock items ship same day.
Send us the old part number, spring color, or the pressure range stamped on your equipment — we'll confirm the right switch and ship it same day if it's in stock.
Request a Quote Shop Antunes Switches Call (901) 458-2000For emergencies, outside of business hours, call #901-604-7069