I have used a variety of sizes of these, and they work great. So far, I've used them on my aquaponics garden grow beds, and fish tanks. I've also used them in the home-made manifold in my solar water heating experiments, and I just completed my permanent solar water heating system, where I used these Uniseals for the input and output pipes to the water storage tank, as well as on the improvised back-up water heating element. In summary, I think that these Uniseals are great, so easy to install, and not one of them has leaked over the four years that they have been installed in my aquaponics garden system. lastly, they are not only easier to install than bulkhead bushings, but they are also considerably less costly. I highly recommend them.
Reviewed by: Jean-Claude Matte from W. Augusta, VA.