Block Tester BT-500 Combustion Leak Test Kit - Made in USA<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Complete Combustion Leak Test Kit - Includes Fluid - Nothing More to Buy</li><li>When Fluid Turns From BLUE to YELLOW Combustion Leak is Present</li><li>Tests in seconds for combustion leaks caused by: Blown Head Gasket (BHG) Cracked Head or Block Pulled Bolts or Studs Warped Sealing Surfaces</li><li>Quality Tool Made in USA for over 45 years with Limited Lifetime Warranty</li><li>Packaged in OEM white box</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41zTUuuz3cL.jpg" noproxy>