Aquastat Immersion Well 1/2 Inch with Clamp

NBK-20929K – Aquastat Immersion Well 1/2 Inch with Clamp | Replaces Honeywell 121371AThe NBK-20929K Aquastat Well Assembly is a precision 1/2 inch immersion well complete with a securing clamp, engineered to house aquastat sensor bulbs for accurate temperature measurement in outdoor wood boilers, hydronic heating systems, and hot water tanks. Proper thermal coupling between the sensor and the water means your aquastat controller reads true temperatures — keeping your system safe, efficient, and running exactly as designed.Key Features1/2 Inch Immersion Well – Standard size fits most aquastat sensor bulbs for accurate, reliable temperature sensingClamp Included – Secures the sensor bulb firmly in place, eliminating movement that causes erratic readingsCorrosion-Resistant Construction – Built to withstand system pressure and moisture for long-term, dependable serviceDirect OEM Replacement – Drop-in replacement for Honeywell 121371A and Grainger 50PL45Broad Compatibility – Works with most standard aquastat controllers used in outdoor boiler and hydronic heating applicationsSpecificationsSKU: NBK-20929KPart Number: 20929K-NBKWell Size: 1/2 inchIncludes: Immersion well and clampApplication: Outdoor wood boilers, hydronic heating, hot water tanksReplaces / Cross-ReferenceHoneywell: 121371AGrainger: 50PL45Common ApplicationsOutdoor wood boilers and biomass boilersHydronic baseboard and radiant floor heating systemsHot water storage tanks using immersion aquastat controlsAny system requiring stable, accurate aquastat temperature sensingWhy Choose the NBK-20929K?A loose or poorly fitted aquastat well leads to inaccurate temperature readings and inefficient system cycling. The NBK-20929K solves that with a snug-fitting 1/2 inch well and a positive-locking clamp that holds the sensor bulb securely in thermal contact with the water. It’s a straightforward, cost-effective replacement for Honeywell 121371A and Grainger 50PL45 that restores accurate control to your heating system.