1/4-Inch NPT Coolant Level Sensor, Engine Fluid Low Indicator for Heavy Duty Trucks, Aftermarket Replacement

Maintain proper under-hood cooling circuit safety and safeguard your long-haul commercial fleet with the professional-grade SOLIDAI 1/4-Inch NPT Engine Coolant Level Sensor. This premium brass component monitors critical expansion tank levels to alert driver dashboards prior to low fluid conditions.Product Features: Heavy-duty class 8 commercial freight trucks operate under demanding daily duty cycles. Constant chemical anti-freeze exposure and engine heat can cause weak polymer sensors to crack or fail. SOLIDAI addresses this by machining the main structural threads from solid premium-grade brass. Featuring a 4-prong male connector top, this aftermarket sensor ensures a secure mechanical fit.Engineered for Industrial Long-Haul Cargo Transport The precision-formed 1/4" NPT tapered threads allow technicians to establish a flush, metal-to-metal seating fit on plastic or aluminum aftermarket expansion tanks.Product Specifications: - Brand: SOLIDAI - Product Type: Heavy Duty Diesel Engine Coolant Level Sensor - Thread Connection: 1/4-Inch NPT Male Tapered Thread - Terminal Configuration: 4-Prong (4-Pin) Male Blade Socket - Material: High-Tensile Anti-Corrosion Brass Body with Polymer Upper Housing - Reference Part Numbers: S291-203, S291203, S291203AInstallation Note: Never over-torque brass fittings into plastic tank reservoirs. Clean the reservoir female thread port of all old thread sealant or debris before installation. Thread the sensor hand-tight, then use a proper deep socket wrench to secure the final fluid seal without twisting the upper 4-pin plastic connector head.SOLIDAI is an independent aftermarket brand.

• 【PRECISE FITMENT】 Precision-machined coolant level sensor designed to meet heavy-duty truck operating specifications. Aftermarket service solution corresponding to reference numbers S291-203, S291203, and S291203A.
• 【WIDE COMPATIBILITY】 Compatible with heavy duty commercial transport trucks equipped with a 1/4-Inch NPT thread coolant expansion tank reservoir port.
• 【FUNCTIONAL MONITORING】 Features a 4-prong electronic connection interface configured for secure alignment with your vehicle's existing wiring harness. Designed to monitor fluid levels and support accurate dashboard telemetry.
• 【ROBUST MATERIALS】 Built with a durable brass sensing body and a high-insulation synthetic upper housing to resist itense under-hood engine compartment heat and chassis vibrations, helping secure an extended operational lifespan.
• 【BUYER VERIFICATION NOTICE】 To assist in achieving a successful mechanical setup, please verify your original stamped manufacturer part number and female terminal socket shape prior to ordering to ensure proper compatibility.