
Injection Epoxy Kits, Ports & Crack Repair Accessories | Built for DIY - Trusted by Pros
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Polygem Corner Ports with Caps – 4-Pack offer a professional-grade solution for concrete crack repair, especially where standard surface ports fall short. Designed specifically for inside and outside corners, these injection ports enable seamless epoxy delivery deep into structural cracks—ensuring a cleaner, faster, and more permanent repair.
Whether you're restoring basement walls, pool foundations, or commercial structures, these durable ports deliver unmatched versatility. The flexible base tab design allows each port to contour to your surface, while included caps prevent backflow and keep your work area clean during multi-stage injections.
Compatible with most low-pressure epoxy injection systems—including Polygem's LCR line—these ports are trusted by contractors, engineers, and DIY users across the country.
For best results, watch our How-To Injection Guide Video demonstrating corner port installation with epoxy. Also see our Before & After Project Gallery for real-world examples.
"These ports made it possible to seal up cracks that ran right into the corner of a basement wall—no mess, and they held tight!" – Tom G., Structural Repair Contractor
"Way better than surface ports for pool walls. They saved us hours of cleanup." – Melissa B., Florida Homeowner
Includes: 4x Polygem Corner Injection Ports with Attached Caps – individually sealed, ready for use.
If you follow the instructions, it works quickly and well. I was able to install 24 linear feet in an hour/1.5 hours. Allowed it to cure for 12 hours. Injected to thinner epoxy 12 hours later. Finished that process in less than an hour. Couple suggestions: make sure you cover over the crack thoroughly so you don't have leakage, when mixing the injectable epoxy, mixing the tube takes some finess to break the aluminum barrier and the screw in the mixer in the tube. Good luck!
It was easy to use, although mixing a small amount for each crack was a must. It firmed up overnight to an extremely hard surface.
I ordered this to apply on a 1/4" crack on the exposed foundation in my garage. The crack runs through the entire wall which is about 1' high. I covered the rear of the wall with cardboard so that the epoxy would not leak out the back. I inserted 3 of the injection ports into the crack and covered the rest with cardboard. Using my caulking gun I injected the epoxy mix into the ports starting from the bottom port. The smell from this is pretty strong so I had a fan blowing air across my work area. I let this sit for a couple days before removing the carboard. The epoxy worked in filling the crack and feels solid.
We applied this to a crack in our basement. It is the best thing we have found for sealing a crack in a wall. Would definitely recommend this for problem in basement wall!