Bought these to use with 5-gallon buckets and 1/2 PVC plumbing as part of a small-scale hydroponics project. The Uniseals themselves were in good shape when I received them, the rubber is nice and not dried out or cracked at all. An issue I had with trying to use them with the 5-gallon buckets is that the wall thickness on the buckets seems to be on the lower end of what works with these seals, especially with the 1-1/4 recommended hole to insert them into. I ended up trying a 1-1/8 hole, but that seems too tight, though it definitely didn't leak. The Uniseal will go into the 1-1/8 hole, but the plastic of the bucket became distorted from the extra pressure. A 1-3/16 might be a better fit, but I haven't had the chance to try.
Reviewed by: A Ewert from New Hampshire.