134a PLUS Leak Stop & UV Dye, No. 623

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April 3, 2026
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The FJC 134a PLUS Leak Stop & UV Dye, No. 623, is designed to help technicians quickly identify and seal leaks. Users can add this product to their system to identify future leaks should they occur. The 623 requires a UV light, sold separately. Compatible with all Ester and PAG oils. Not for use on electric or hybrid vehicles. Features a self-sealing top and is 12 oz.

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