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🚀 Fix leaks fast, keep engines running stronger—no downtime, no drama!
K-Seal ST5516 is a 16 oz heavy-duty coolant leak repair solution designed for rapid, one-step sealing of leaks in water-cooled engines. Compatible with all antifreeze types and engineered for commercial and agricultural vehicles, it fixes radiator, head gasket, freeze plugs, and more without flushing, ensuring efficient engine cooling and minimal maintenance downtime.








| ASIN | B002BJEG3U |
| Best Sellers Rank | #9,078 in Automotive ( See Top 100 in Automotive ) #43 in Antifreezes & Coolants |
| Brand | K-Seal |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,652) |
| Date First Available | May 29, 2009 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.19 pounds |
| Item model number | ST5516HD |
| Manufacturer | Solv-Tec |
| Manufacturer Part Number | ST5516 |
| Model | ST5516HD |
| Product Dimensions | 5.9 x 4.1 x 1.9 inches |
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