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Features and Benefits Spotgun Jr. Injection Gun with R-12 and R-134a adapters A/C ExtenDye Cartridges (6 x 1/4 oz.) A/C ExtenDye with QuietCool Technology Services up to 6 vehicles with service stickers included Rugged storage case The world's best selling Spotgun Leak Detection Injection System. UView A/C ExtenDye is super concentrated to detect leaks quickly, saving time and money. The QuietCool Technology additive package boosts performance and increases longevity of the A/C system. ExtenDye is SAE J2297 certified, hybrid safe, and is solvent-free.