This M12x1.5 to 3/8”-18 NPT coolant temperature sensor adapter is designed specifically for LS engine swaps, allowing you to install aftermarket coolant temperature sensors or gauges with proper thread compatibility and a leak-free seal.

Machined from durable stainless steel, this adapter offers excellent strength, corrosion resistance, and long-term reliability in high-heat engine environments. It replaces the factory plug location on the passenger-side cylinder head and is compatible with low-profile temperature senders commonly used in swap applications.

Key Features:

• Designed for LS engine swap applications
• Converts M12x1.5 threads to 3/8”-18 NPT
• Ideal for aftermarket coolant temperature sensors and gauges
• Stainless steel construction for durability and corrosion resistance
• Precision-machined threads for a secure, leak-free fit

Specifications:

• Material: Stainless Steel
• Thread Size: M12x1.5 to 3/8”-18 NPT (female)
• Finish: Natural stainless
• Condition: Brand New

Fitment:

• Compatible with all LS-series engines

Installation Notes:

• Installs in the factory coolant port location
• No installation tools or instructions included
• Professional installation recommended

What’s Included:

• 1x M12x1.5 to 3/8”-18 NPT Adapter
• 1x Sealing Gasket

This adapter is an essential solution for clean, reliable sensor installation during LS swaps, helping ensure accurate coolant temperature readings without compromising fitment or durability.

A must-have fitting for clean LS engine swap builds.