PMW-2S CROWN AQUASTAT IMMERSION WELL – 1/2" STANDARD COPPER & BRASS REPLACEMENT
The Crown PMW-2S Aquastat Immersion Well is a high-quality copper and brass replacement designed for accurate temperature sensing in hydronic and boiler systems. Its durable construction ensures long-lasting corrosion resistance while protecting your immersion-type aquastat or sensor from direct contact with water, delivering reliable and precise temperature control.
✅ Key Features
💚 Copper & Brass Construction – Premium materials provide superior corrosion resistance and long-lasting performance.
💚 Direct Replacement for Honeywell 121371A – Perfect drop-in replacement for existing systems.
💚 Standard 1/2" NPT Thread – Fits most standard aquastat or temperature sensor installations.
💚 Compact & Easy to Install – 4-3/4" overall length with 3" insertion length for quick installation.
💚 Hex for Tightening – 7/8" hex ensures secure mounting.
💚 Protects Sensors – Prevents direct contact between aquastat and liquid for accurate readings and extended sensor life.
📊 Technical Specifications
| Specification | Detail |
|---|
| Part Number |
PMW-2S |
| Replaces |
Honeywell 121371A |
| Material |
Copper & Brass Body |
| Thread Size |
1/2" NPT |
| Hex Size |
7/8" |
| Overall Length (OAL) |
4-3/4" |
| Insertion Length |
3" |
| Application |
Aquastat / Temperature Sensor Protection |
| Mounting Type |
Immersion Well |
⚠️ Common Symptoms / When to Replace
Replace the aquastat immersion well if you notice:
🔥 Inaccurate temperature readings from your aquastat.
🔥 Corrosion, cracks, or leaks in the well body.
🔥 Difficulty installing a sensor or poor fit with the existing sensor.
🔥 Sensor failure due to direct exposure to boiler water.
❓ Frequently Asked Questions (FAQ)
Q: What part does this replace?
A: The PMW-2S is a direct replacement for Honeywell 121371A.
Q: What size threads does it use?
A: It uses 1/2" NPT threads for standard immersion installations.
Q: What is the insertion length?
A: The sensor insertion length is 3 inches, with a total overall length of 4-3/4 inches.
Q: Can I use this with any aquastat?
A: It fits most standard immersion-type aquastats compatible with 1/2" NPT copper & brass wells.
🛒 Shopping Tips
✔ Verify your system’s thread size and sensor insertion length before ordering.
✔ Inspect your old well for corrosion or damage prior to replacement.
✔ Ensure the sensor is fully seated in the well for accurate temperature readings.
✔ Use proper sealing tape or paste on threads to prevent leaks.
