Overview Professional brass step-up adaptor that converts 1/8" NPTF sensor ports to accept 3/8" NPTF temperature and pressure sensors. Essential for builds where you need to mount larger sensors in smaller factory ports, or when adapting aftermarket sensor configurations to match your Haltech ECU setup. Technical Specifications Part Number: HT-120000 Thread Size (Input): 1/8" NPTF Female Thread Size (Output): 3/8" NPTF Male Length: 20mm Material: Brass construction Temperature Rating: Suitable for engine bay applications Why You Need This Engine builders constantly face sensor port mismatches — your aftermarket oil temperature sensor is 3/8" NPTF but the factory sump has a 1/8" port, or you're upgrading to a larger coolant temperature sensor for better accuracy. This brass adaptor solves that problem permanently. We see this constantly in LS swap builds where factory GM sensors don't match aftermarket sensor configurations, or in Japanese engine swaps like 2JZ and RB25/26 where you're mixing OEM ports with modern Haltech sensor packages. The 20mm length provides adequate clearance without excessive bulk, crucial in tight engine bays. Brass construction offers superior corrosion resistance compared to steel alternatives and won't seize like aluminium can in dissimilar metal applications. The NPTF (dry seal) threads create a leak-proof seal without requiring thread sealant, though we still recommend a light application of high-temp thread paste for insurance on critical applications like oil pressure sensing. ECU & System Compatibility Universal fitment for any sensor application requiring 1/8" to 3/8" NPTF conversion. Commonly used with Haltech Elite and Nexus ECU sensor installations, particularly for temperature and pressure monitoring where larger sensor bodies provide improved accuracy and response times. What's in the Box 1 x Brass adaptor (1/8" NPTF female to 3/8" NPTF male) Complete Your Build Most customers requiring sensor adaptors are also upgrading their temperature and pressure monitoring setup. Our technical team can recommend the ideal sensor combinations for your specific application and ensure thread compatibility throughout your installation. With UK stock and fast despatch, we'll have your sensor adaptor solutions sorted quickly — contact us for application-specific advice on sensor selection and mounting configurations.
