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I have 10 packages of GM Coolant Sealing Tabs. Part number #12378254.
12378254 – GM/AC Delco Cooling System Seal Tablets Contains Five 4 Gram Tablets
Original organic formula designed for use in cooling systems to seal leaks and prevent leaks due to casting porosity in engine components.
Seals minor leaks and porosity in cooling systems
4 and 6 cylinder engines: 20 grams of material – (5 pellets of 12378254 or 2 pellets of 3634621)Cadillac Northstar: 30 grams of material (7 pellets of 12378254 or 3 pellets of 3634621)
Cadillac 4.1L, 4.5L, 4.9L : 60 grams of material (15 pellets of 12378254 or 6 pellets of 3634621)
Call Jon at 502-5 Eight 4-23 One One
GM Coolant Sealing Tabs