High Temperature Silicone Welding Back Purging Plugs Complete Kit 1.25"-4" (Set of 12)

Not a bad product just not the right fit for sch 10 pipe. The 4inch plug was a decent fit in 3inch sch 10 stainless and made a really good purge. The attached images show the 4inch plug in 3inch pipe vs 4 inch pipe. I assume this product is more the hobbyist head manifold welder.

Purple one was not even drilled. The most common size 3" not included. Worst part is they don't stay in the pipe constantly falling out. I have to wrap them with aluminum foil which I used to do before I got these tought it would speed up my work but it did the opposite.

These work great and the little purge stone is great. I bought these for stainless process pipe fabrication they work great on 2” pipe. But none of these plugs fit 3” pipe.