Here is the specification for the steel oil temperature sump plug sensor reducing bush adapter:

Specification:

• Male Thread: M20x1.5 ( 1.5mm Pitch )
  
• Female Thread: 1/4'' x 18 NPT ( 18 TPI )
  
• Male Thread Length: Approx. 14mm
• Female Thread Length: Approx. 19mm
• OVER ALL LENGTH :Approx.20mm
  
• Material: Steel
• Finishing: Bright Zinc Plated

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