Aftermarket engine cooling system expansion overflow bottle fluid level sensor manufactured by DASPARTS. This direct-replacement sensor matches original factory part number 61-31-1-384-739 / 61311384739 and arrives brand new old stock (NOS) inside its original labeled product box and protective factory-sealed inner sleeve.

The unit incorporates a high-grade chemical-resistant translucent polymer probe cylinder column populated by an integrated sliding float ring mechanism, terminating at a right-angle 2-pin keyed electrical wiring harness interface socket. It threads flush into the lower basin of the radiator expansion overflow tank to actively monitor fluid volume limits and trigger safety warning lamps before overheating conditions develop.

Vehicle Compatibility:

• BMW E36 3-Series (1992–1999): 325i, 325is, 328i, 328is, 318i, 318is, and M3 (Coupe, Sedan, Convertible)
• BMW E34 5-Series (1989–1995): 525i, 525iT Wagon configurations

Product Specifications:

• Brand / Manufacturer: DASPARTS
• Cross-Referenced OEM Part Number: 61 31 1 384 739 (61311384739)
• Component Class: Engine Cooling / Radiator Fluid Level Switch
• Electrical Interface: 2-Pin Male Terminal Right Angle Socket
• Country of Manufacture: China
• Condition: Brand New In Box (NIB) / Factory-Sealed Sleeve