💧 PMW-2SE CROWN AQUASTAT IMMERSION WELL – 1/2" EXTENDED COPPER & BRASS REPLACEMENT
The Crown PMW-2SE Aquastat Immersion Well is a copper and brass extended-length replacement designed for precise 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. The extended design allows installation in systems requiring additional reach for accurate temperature readings.
✅ Key Features
💚 Copper & Brass Construction – Premium materials for superior corrosion resistance and long service life.
💚 Direct Replacement for Honeywell 121371L – Reliable drop-in fit for existing systems.
💚 Extended 1/2" Design – 6-3/8" overall length to accommodate deeper sensor placements.
💚 Standard 1/2" NPT Thread – Fits most standard aquastat or temperature sensor installations.
💚 Hex for Tightening – 7/8" hex ensures secure and easy mounting.
💚 Protects Sensors – Prevents direct contact between sensor and liquid for precise readings and sensor longevity.
📊 Technical Specifications
| Specification | Detail |
|---|
| Part Number |
PMW-2SE |
| Replaces |
Honeywell 121371L |
| Material |
Copper & Brass Body |
| Thread Size |
1/2" NPT |
| Hex Size |
7/8" |
| Overall Length (OAL) |
6-3/8" |
| Insertion Length |
3" |
| Application |
Aquastat / Temperature Sensor Protection |
| Mounting Type |
Immersion Well |
⚠️ Common Symptoms / When to Replace
Replace the 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-2SE is a direct replacement for Honeywell 121371L.
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 6-3/8 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, especially systems requiring extended reach.
🛒 Shopping Tips
✔ Verify your system’s thread size, insertion length, and overall depth 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.
