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Extended Length Adapter - Male M12-1.5 to Female 3/8"-18 NPT Adapter This adapts SBC/BBC (3/8" NPT) coolant temperature sensors to fit into LS series cylinder heads Compatible with: all GM LS Series Engines Made in Wichita, Kansas from aerospace grade, USA produced, billet aluminum Includes: 1 aluminum adapter, 1 sealing washer Will fit sensors with 1.7" length, measured from probe tip to the outer edge of adapter. Most aftermarket gauges will use a 3/8" NPT thread adapter (usually included with gauge)