I ordered these seals for my industrial and scientific plumbing needs, and I was not disappointed .When I tried this product, I found them to be durable and long-lasting and they were easy to install. The seals STAYED in place and prevented leaks, which saved me time and money. The only con was the package only came with 30 seals, which might not be enough for larger projects. Overall, I highly recommend these seals for any plumbing project..See full review